{"id":3810,"date":"2020-10-14T11:25:00","date_gmt":"2020-10-14T11:25:00","guid":{"rendered":"http:\/\/the-codest.localhost\/blog\/web-app-security-xss-vulnerability\/"},"modified":"2026-04-27T10:24:05","modified_gmt":"2026-04-27T10:24:05","slug":"%ce%b1%cf%83%cf%86%ce%ac%ce%bb%ce%b5%ce%b9%ce%b1-%ce%b5%cf%86%ce%b1%cf%81%ce%bc%ce%bf%ce%b3%cf%8e%ce%bd-%ce%b9%cf%83%cf%84%ce%bf%cf%8d-xss-%ce%b5%cf%85%cf%80%ce%ac%ce%b8%ce%b5%ce%b9%ce%b1","status":"publish","type":"post","link":"https:\/\/thecodest.co\/el\/blog\/web-app-security-xss-vulnerability\/","title":{"rendered":"\u0391\u03c3\u03c6\u03ac\u03bb\u03b5\u03b9\u03b1 \u03b5\u03c6\u03b1\u03c1\u03bc\u03bf\u03b3\u03ce\u03bd Web - \u0395\u03c5\u03c0\u03ac\u03b8\u03b5\u03b9\u03b1 XSS"},"content":{"rendered":"<h2 class=\"wp-block-heading\">\u03a3\u03b5\u03bd\u03ac\u03c1\u03b9\u03bf \u03b5\u03c0\u03af\u03b8\u03b5\u03c3\u03b7\u03c2<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u039f \u03b5\u03c0\u03b9\u03c4\u03b9\u03b8\u03ad\u03bc\u03b5\u03bd\u03bf\u03c2 \u03b5\u03bd\u03c4\u03bf\u03c0\u03af\u03b6\u03b5\u03b9 \u03c4\u03b7\u03bd \u03b5\u03c5\u03c0\u03ac\u03b8\u03b5\u03b9\u03b1 XSS \u03c3\u03b5 \u03ad\u03bd\u03b1\u03bd \u03b9\u03c3\u03c4\u03cc\u03c4\u03bf\u03c0\u03bf \u03c0\u03bf\u03c5 \u03c7\u03c1\u03b7\u03c3\u03b9\u03bc\u03bf\u03c0\u03bf\u03b9\u03b5\u03af \u03c4\u03bf \u03b8\u03cd\u03bc\u03b1, \u03c0.\u03c7. \u03c4\u03bf\u03bd \u03b9\u03c3\u03c4\u03cc\u03c4\u03bf\u03c0\u03bf \u03bc\u03b9\u03b1\u03c2 \u03c4\u03c1\u03ac\u03c0\u03b5\u03b6\u03b1\u03c2.<\/li>\n\n\n\n<li>\u03a4\u03bf \u03b8\u03cd\u03bc\u03b1 \u03b5\u03af\u03bd\u03b1\u03b9 \u03c3\u03c5\u03bd\u03b4\u03b5\u03b4\u03b5\u03bc\u03ad\u03bd\u03bf \u03c3\u03b5 \u03b1\u03c5\u03c4\u03ae \u03c4\u03b7 \u03c3\u03b5\u03bb\u03af\u03b4\u03b1<\/li>\n\n\n\n<li>\u039f \u03b5\u03c0\u03b9\u03c4\u03b9\u03b8\u03ad\u03bc\u03b5\u03bd\u03bf\u03c2 \u03c3\u03c4\u03ad\u03bb\u03bd\u03b5\u03b9 \u03c3\u03c4\u03bf \u03b8\u03cd\u03bc\u03b1 \u03bc\u03b9\u03b1 \u03c0\u03b1\u03c1\u03b1\u03c0\u03bf\u03b9\u03b7\u03bc\u03ad\u03bd\u03b7 \u03b4\u03b9\u03b5\u03cd\u03b8\u03c5\u03bd\u03c3\u03b7 URL<\/li>\n\n\n\n<li>\u03a4\u03bf \u03b8\u03cd\u03bc\u03b1 \u03ba\u03ac\u03bd\u03b5\u03b9 \u03ba\u03bb\u03b9\u03ba \u03c3\u03c4\u03b7 \u03b4\u03b9\u03b5\u03cd\u03b8\u03c5\u03bd\u03c3\u03b7 URL<\/li>\n\n\n\n<li>\u03a3\u03c4\u03bf \u03b8\u03cd\u03bc\u03b1 <a href=\"https:\/\/thecodest.co\/el\/dictionary\/how-fintech-helps-banks\/\">\u03c4\u03c1\u03ac\u03c0\u03b5\u03b6\u03b1<\/a> \u03b9\u03c3\u03c4\u03bf\u03c3\u03b5\u03bb\u03af\u03b4\u03b1, <a href=\"https:\/\/thecodest.co\/el\/blog\/hire-javascript-developer\/\">JavaScript<\/a> <a href=\"https:\/\/thecodest.co\/el\/dictionary\/what-is-code-refactoring\/\">\u03ba\u03c9\u03b4\u03b9\u03ba\u03cc\u03c2<\/a> \u03b1\u03c1\u03c7\u03af\u03b6\u03b5\u03b9 \u03bd\u03b1 \u03b5\u03ba\u03c4\u03b5\u03bb\u03b5\u03af\u03c4\u03b1\u03b9 \u03b3\u03b9\u03b1 \u03bd\u03b1 \u03c5\u03c0\u03bf\u03ba\u03bb\u03ad\u03c8\u03b5\u03b9 \u03c4\u03bf <a href=\"https:\/\/thecodest.co\/el\/blog\/app-data-collection-security-risks-value-and-types-explored\/\">\u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03b1<\/a> \u03ae \u03bd\u03b1 \u03b5\u03ba\u03c4\u03b5\u03bb\u03ad\u03c3\u03b5\u03b9 \u03bc\u03b5\u03c4\u03b1\u03c6\u03bf\u03c1\u03ac \u03b3\u03b9\u03b1 \u03bb\u03bf\u03b3\u03b1\u03c1\u03b9\u03b1\u03c3\u03bc\u03cc \u03c4\u03bf\u03c5 \u03c3\u03c4\u03bf \u03bb\u03bf\u03b3\u03b1\u03c1\u03b9\u03b1\u03c3\u03bc\u03cc \u03c4\u03bf\u03c5 \u03b5\u03c0\u03b9\u03c4\u03b9\u03b8\u03ad\u03bc\u03b5\u03bd\u03bf\u03c5<\/li>\n<\/ol>\n\n\n\n<p>\u0391\u03be\u03af\u03b6\u03b5\u03b9 \u03bd\u03b1 \u03c3\u03b7\u03bc\u03b5\u03b9\u03c9\u03b8\u03b5\u03af \u03cc\u03c4\u03b9 \u03bf\u03b9 \u03c0\u03c1\u03ac\u03be\u03b5\u03b9\u03c2 \u03c0\u03bf\u03c5 \u03b5\u03ba\u03c4\u03b5\u03bb\u03bf\u03cd\u03bd\u03c4\u03b1\u03b9 \u03b3\u03b9\u03b1 \u03bb\u03bf\u03b3\u03b1\u03c1\u03b9\u03b1\u03c3\u03bc\u03cc \u03c4\u03bf\u03c5 \u03b8\u03cd\u03bc\u03b1\u03c4\u03bf\u03c2 \u03bc\u03c0\u03bf\u03c1\u03b5\u03af \u03bd\u03b1 \u03b5\u03af\u03bd\u03b1\u03b9 \u03b1\u03cc\u03c1\u03b1\u03c4\u03b5\u03c2 \u03b3\u03b9\u03b1 \u03c4\u03bf \u03b8\u03cd\u03bc\u03b1, \u03ba\u03b1\u03b8\u03ce\u03c2 \u03bc\u03c0\u03bf\u03c1\u03b5\u03af \u03bd\u03b1 \u03bb\u03b1\u03bc\u03b2\u03ac\u03bd\u03bf\u03c5\u03bd \u03c7\u03ce\u03c1\u03b1 \u03c3\u03c4\u03bf \u03c0\u03b1\u03c1\u03b1\u03c3\u03ba\u03ae\u03bd\u03b9\u03bf \u03bc\u03b5 \u03c4\u03b7 \u03c7\u03c1\u03ae\u03c3\u03b7 \u03c4\u03bf\u03c5 \u03c4\u03c1\u03b1\u03c0\u03b5\u03b6\u03b9\u03ba\u03bf\u03cd <a href=\"https:\/\/thecodest.co\/el\/blog\/compare-staff-augmentation-firms-that-excel-in-api-team-staffing-for-financial-technology-projects\/\">API<\/a>, \u03ae \u03bf \u03b5\u03c0\u03b9\u03c4\u03b9\u03b8\u03ad\u03bc\u03b5\u03bd\u03bf\u03c2 \u03bc\u03c0\u03bf\u03c1\u03b5\u03af \u03bd\u03b1 \u03c4\u03b9\u03c2 \u03b5\u03ba\u03c4\u03b5\u03bb\u03ad\u03c3\u03b5\u03b9 \u03b1\u03c1\u03b3\u03cc\u03c4\u03b5\u03c1\u03b1 \u03bc\u03b5 \u03c4\u03b1 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03b1 \u03c0\u03bf\u03c5 \u03b1\u03c0\u03b1\u03b9\u03c4\u03bf\u03cd\u03bd\u03c4\u03b1\u03b9 \u03b3\u03b9\u03b1 \u03c4\u03bf\u03bd \u03ad\u03bb\u03b5\u03b3\u03c7\u03bf \u03c4\u03b1\u03c5\u03c4\u03cc\u03c4\u03b7\u03c4\u03b1\u03c2, \u03c4\u03b1 tokens, \u03c4\u03b1 cookies \u03ba.\u03bb\u03c0.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u03a4\u03cd\u03c0\u03bf\u03b9 XSS<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. Reflected XSS <\/h3>\n\n\n\n<p>\u03a0\u03c1\u03cc\u03ba\u03b5\u03b9\u03c4\u03b1\u03b9 \u03b3\u03b9\u03b1 \u03ad\u03bd\u03b1 \u03b5\u03af\u03b4\u03bf\u03c2 \u03cc\u03c0\u03bf\u03c5 \u03bf \u03ba\u03ce\u03b4\u03b9\u03ba\u03b1\u03c2 HTML\/JavaScript \u03c0\u03bf\u03c5 \u03c0\u03b5\u03c1\u03b9\u03ad\u03c7\u03b5\u03c4\u03b1\u03b9 \u03c3\u03b5 \u03bf\u03c0\u03bf\u03b9\u03b1\u03b4\u03ae\u03c0\u03bf\u03c4\u03b5 \u03c0\u03b1\u03c1\u03ac\u03bc\u03b5\u03c4\u03c1\u03bf (\u03c0.\u03c7. GET, POST \u03ae cookie) \u03b5\u03bc\u03c6\u03b1\u03bd\u03af\u03b6\u03b5\u03c4\u03b1\u03b9 \u03c3\u03c4\u03b7\u03bd \u03b1\u03c0\u03cc\u03ba\u03c1\u03b9\u03c3\u03b7.<\/p>\n\n\n\n<p>\u039c\u03b9\u03b1 \u03c3\u03b5\u03bb\u03af\u03b4\u03b1 \u03bc\u03b5 \u03b5\u03af\u03c3\u03bf\u03b4\u03bf \u03ba\u03b5\u03b9\u03bc\u03ad\u03bd\u03bf\u03c5 \u03b3\u03b9\u03b1 \u03b1\u03bd\u03b1\u03b6\u03ae\u03c4\u03b7\u03c3\u03b7 \u03b3\u03b9\u03b1 \u03ba\u03ac\u03c4\u03b9 \u03c0\u03bf\u03c5 \u03b2\u03ac\u03b6\u03b5\u03b9 \u03c4\u03b7\u03bd \u03c0\u03b1\u03c1\u03ac\u03bc\u03b5\u03c4\u03c1\u03bf <code>?search=foo<\/code> \u03c3\u03c4\u03b7\u03bd \u03ba\u03b1\u03c4\u03ac\u03bb\u03b7\u03be\u03b7 \u03c4\u03b7\u03c2 \u03b4\u03b9\u03b5\u03cd\u03b8\u03c5\u03bd\u03c3\u03b7\u03c2 URL \u03ba\u03b1\u03c4\u03ac \u03c4\u03b7\u03bd \u03b1\u03bd\u03b1\u03b6\u03ae\u03c4\u03b7\u03c3\u03b7 \u03c4\u03bf\u03c5 API. \u039c\u03b5\u03c4\u03ac \u03c4\u03b7\u03bd \u03b5\u03b9\u03c3\u03b1\u03b3\u03c9\u03b3\u03ae \u03bf\u03c0\u03bf\u03b9\u03b1\u03c3\u03b4\u03ae\u03c0\u03bf\u03c4\u03b5 \u03c6\u03c1\u03ac\u03c3\u03b7\u03c2, \u03b5\u03ac\u03bd \u03b4\u03b5\u03bd \u03b2\u03c1\u03b5\u03b8\u03b5\u03af, \u03c4\u03bf\u03c0\u03bf\u03b8\u03b5\u03c4\u03b5\u03af\u03c4\u03b1\u03b9 \u03ad\u03bd\u03b1 \u03bc\u03ae\u03bd\u03c5\u03bc\u03b1 \u03b5\u03c0\u03b9\u03c3\u03c4\u03c1\u03bf\u03c6\u03ae\u03c2 \u03c3\u03b5 HTML ex.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"markup\" class=\"language-markup\">&lt;div&gt;&Delta;&epsilon;&nu; &beta;&rho;\u03ad&theta;&eta;&kappa;&epsilon; &alpha;&pi;&omicron;&tau;\u03ad&lambda;&epsilon;&sigma;&mu;&alpha; &gamma;&iota;&alpha; &lt;b&gt;foo&lt;\/b&gt;&lt;\/div&gt;<\/code><\/pre>\n\n\n\n<p>\u039c\u03c0\u03bf\u03c1\u03bf\u03cd\u03bc\u03b5 \u03bd\u03b1 \u03c0\u03c1\u03bf\u03c3\u03c0\u03b1\u03b8\u03ae\u03c3\u03bf\u03c5\u03bc\u03b5 \u03bd\u03b1 \u03b2\u03ac\u03bb\u03bf\u03c5\u03bc\u03b5 \u03c4\u03b7 \u03b4\u03b9\u03b5\u03cd\u03b8\u03c5\u03bd\u03c3\u03b7 URL <code>?search=<\/code>..<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2.DOM XSS <\/h3>\n\n\n\n<p>\u0391\u03c5\u03c4\u03cc \u03c3\u03c5\u03bc\u03b2\u03b1\u03af\u03bd\u03b5\u03b9 \u03cc\u03c4\u03b1\u03bd \u03b7 \u03b5\u03ba\u03c4\u03ad\u03bb\u03b5\u03c3\u03ae \u03c4\u03bf\u03c5 \u03b5\u03bd\u03b5\u03c1\u03b3\u03bf\u03c0\u03bf\u03b9\u03b5\u03af\u03c4\u03b1\u03b9 \u03bc\u03b5 \u03c4\u03b7 \u03c7\u03c1\u03ae\u03c3\u03b7 \u03b5\u03c0\u03b9\u03ba\u03af\u03bd\u03b4\u03c5\u03bd\u03c9\u03bd \u03bb\u03b5\u03b9\u03c4\u03bf\u03c5\u03c1\u03b3\u03b9\u03ce\u03bd \u03c3\u03c4\u03bf JavaScript, \u03cc\u03c0\u03c9\u03c2 <code>`eval`<\/code> \u03ae <code>`innerHtml`<\/code>. \u03a4\u03bf \"\u0396\u03c9\u03bd\u03c4\u03b1\u03bd\u03cc \u03c0\u03b1\u03c1\u03ac\u03b4\u03b5\u03b9\u03b3\u03bc\u03b1\" \u03c0\u03b1\u03c1\u03b1\u03ba\u03ac\u03c4\u03c9 \u03b4\u03b5\u03af\u03c7\u03bd\u03b5\u03b9 \u03bc\u03b9\u03b1 \u03b5\u03c0\u03af\u03b8\u03b5\u03c3\u03b7 DOM XSS \u03bc\u03b5 \u03b2\u03ac\u03c3\u03b7 \u03c4\u03bf <code>`innerHtml`<\/code> \u03bb\u03b5\u03b9\u03c4\u03bf\u03c5\u03c1\u03b3\u03af\u03b1.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. \u0391\u03c0\u03bf\u03b8\u03b7\u03ba\u03b5\u03c5\u03bc\u03ad\u03bd\u03bf XSS <\/h3>\n\n\n\n<p>\u0395\u03b4\u03ce \u03bf \u03ba\u03b1\u03ba\u03cc\u03b2\u03bf\u03c5\u03bb\u03bf\u03c2 \u03ba\u03ce\u03b4\u03b9\u03ba\u03b1\u03c2 \u03b3\u03c1\u03ac\u03c6\u03b5\u03c4\u03b1\u03b9 \u03c3\u03c4\u03b7\u03bd \u03c0\u03bb\u03b5\u03c5\u03c1\u03ac \u03c4\u03bf\u03c5 \u03b4\u03b9\u03b1\u03ba\u03bf\u03bc\u03b9\u03c3\u03c4\u03ae. \u0393\u03b9\u03b1 \u03c0\u03b1\u03c1\u03ac\u03b4\u03b5\u03b9\u03b3\u03bc\u03b1, \u03bc\u03c0\u03bf\u03c1\u03bf\u03cd\u03bc\u03b5 \u03bd\u03b1 \u03c3\u03c4\u03b5\u03af\u03bb\u03bf\u03c5\u03bc\u03b5 \u03ad\u03bd\u03b1 \u03c3\u03c7\u03cc\u03bb\u03b9\u03bf \u03bc\u03b5 \u03ba\u03b1\u03ba\u03cc\u03b2\u03bf\u03c5\u03bb\u03bf \u03ba\u03ce\u03b4\u03b9\u03ba\u03b1 \u03c3\u03b5 \u03bc\u03b9\u03b1 \u03b4\u03b7\u03bc\u03bf\u03c3\u03af\u03b5\u03c5\u03c3\u03b7 \u03b9\u03c3\u03c4\u03bf\u03bb\u03bf\u03b3\u03af\u03bf\u03c5 \u03c0\u03bf\u03c5 \u03bc\u03b5\u03c4\u03b1\u03c6\u03bf\u03c1\u03c4\u03ce\u03bd\u03b5\u03c4\u03b1\u03b9 \u03c3\u03c4\u03bf\u03bd \u03b4\u03b9\u03b1\u03ba\u03bf\u03bc\u03b9\u03c3\u03c4\u03ae. \u03a4\u03bf \u03ad\u03c1\u03b3\u03bf \u03c4\u03bf\u03c5 \u03b5\u03af\u03bd\u03b1\u03b9, \u03b3\u03b9\u03b1 \u03c0\u03b1\u03c1\u03ac\u03b4\u03b5\u03b9\u03b3\u03bc\u03b1, \u03bd\u03b1 \u03c0\u03b5\u03c1\u03b9\u03bc\u03ad\u03bd\u03b5\u03b9 \u03c4\u03b7 \u03bc\u03b5\u03c4\u03c1\u03b9\u03bf\u03c0\u03ac\u03b8\u03b5\u03b9\u03b1 \u03c4\u03bf\u03c5 \u03b4\u03b9\u03b1\u03c7\u03b5\u03b9\u03c1\u03b9\u03c3\u03c4\u03ae \u03ba\u03b1\u03b9 \u03c3\u03c4\u03b7 \u03c3\u03c5\u03bd\u03ad\u03c7\u03b5\u03b9\u03b1 \u03bd\u03b1 \u03ba\u03bb\u03ad\u03c8\u03b5\u03b9 \u03c4\u03b1 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03b1 \u03c4\u03b7\u03c2 \u03c3\u03c5\u03bd\u03b5\u03b4\u03c1\u03af\u03b1\u03c2 \u03c4\u03bf\u03c5 \u03ba.\u03bb\u03c0.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u039c\u03ad\u03b8\u03bf\u03b4\u03bf\u03b9 \u03ad\u03b3\u03c7\u03c5\u03c3\u03b7\u03c2<\/h2>\n\n\n\n<p>1. \u03a3\u03c4\u03bf \u03c0\u03b5\u03c1\u03b9\u03b5\u03c7\u03cc\u03bc\u03b5\u03bd\u03bf \u03c4\u03b7\u03c2 \u03b5\u03c4\u03b9\u03ba\u03ad\u03c4\u03b1\u03c2<\/p>\n\n\n\n<p><code>`onerror=alert('XSS')`<\/code>\u03c3\u03c4\u03bf<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">&lt;img src onerror=&quot;alert(&#039;XSS&#039;)&quot; \/&gt;<\/code><\/pre>\n\n\n\n<p>2. \u03a3\u03c4\u03bf \u03c0\u03b5\u03c1\u03b9\u03b5\u03c7\u03cc\u03bc\u03b5\u03bd\u03bf \u03c4\u03bf\u03c5 \u03c7\u03b1\u03c1\u03b1\u03ba\u03c4\u03b7\u03c1\u03b9\u03c3\u03c4\u03b9\u03ba\u03bf\u03cd<\/p>\n\n\n\n<p><code>`\" onmouseover=alert('XSS')`<\/code> \u03c3\u03c4\u03bf<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">&lt;div class=&quot;&quot; onmouseover=&quot;alert(&#039;XSS&#039;)&quot;&quot;&gt;&lt;\/div&gt;<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<ol class=\"wp-block-list\" start=\"3\">\n<li>\u03a3\u03c4\u03bf \u03c0\u03b5\u03c1\u03b9\u03b5\u03c7\u03cc\u03bc\u03b5\u03bd\u03bf \u03c4\u03bf\u03c5 \u03c7\u03b1\u03c1\u03b1\u03ba\u03c4\u03b7\u03c1\u03b9\u03c3\u03c4\u03b9\u03ba\u03bf\u03cd \u03c7\u03c9\u03c1\u03af\u03c2 \u03c4\u03b1 \u03b5\u03b9\u03c3\u03b1\u03b3\u03c9\u03b3\u03b9\u03ba\u03ac<\/li>\n<\/ol>\n\n\n\n<p><code>x onclick=alert('XSS')<\/code>\u03c3\u03c4\u03bf<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">&lt;div class=&quot;x&quot; onclick=&quot;alert(&#039;XSS&#039;)&quot;&gt;&lt;\/div&gt;<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<ol class=\"wp-block-list\" start=\"4\">\n<li>\u03a3\u03c4\u03bf <code>href<\/code>\u03a7\u03b1\u03c1\u03b1\u03ba\u03c4\u03b7\u03c1\u03b9\u03c3\u03c4\u03b9\u03ba\u03cc ef<\/li>\n<\/ol>\n\n\n\n<p><code>javascript:alert('XSS')<\/code> \u03c3\u03c4\u03bf<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript\">&lt;a href=&quot;javascript:alert(&#039;XSS&#039;)&quot;&gt;&lt;\/a&gt;<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<ol class=\"wp-block-list\" start=\"5\">\n<li>\u03a3\u03c4\u03b7 \u03c3\u03c5\u03bc\u03b2\u03bf\u03bb\u03bf\u03c3\u03b5\u03b9\u03c1\u03ac \u03bc\u03ad\u03c3\u03b1 \u03c3\u03c4\u03bf\u03bd \u03ba\u03c9\u03b4\u03b9\u03ba\u03cc JavaScript<\/li>\n<\/ol>\n\n\n\n<p><code>\";alert('XSS')\/\/<\/code> \u03c3\u03c4\u03bf<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">&lt;script&gt;let username=\"\";alert('XSS')\/\/\";&lt;\/script&gt;<\/code><\/pre>\n\n\n\n<ol class=\"wp-block-list\" start=\"6\">\n<li>\u03a3\u03c4\u03bf \u03c7\u03b1\u03c1\u03b1\u03ba\u03c4\u03b7\u03c1\u03b9\u03c3\u03c4\u03b9\u03ba\u03cc \u03bc\u03b5 \u03c4\u03bf \u03c3\u03c5\u03bc\u03b2\u03ac\u03bd JavaScript<\/li>\n<\/ol>\n\n\n\n<p><code>&#039;);alert('XSS')\/\/<\/code> \u03cc\u03c0\u03bf\u03c5 <code>&amp;#39,<\/code> \u03b5\u03af\u03bd\u03b1\u03b9 \u03ad\u03bd\u03b1 \u03b1\u03c0\u03bb\u03cc \u03b5\u03b9\u03c3\u03b1\u03b3\u03c9\u03b3\u03b9\u03ba\u03cc, \u03c3\u03b5<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"markup\" class=\"language-markup\">&lt;div onclick=&quot;change(&#039;&amp;#39;);alert(&#039;XSS&#039;)\/\/&#039;)&quot;&gt;John&lt;\/div&gt;<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<ol class=\"wp-block-list\" start=\"7\">\n<li>\u03a3\u03c4\u03bf <code>href<\/code> \u03c7\u03b1\u03c1\u03b1\u03ba\u03c4\u03b7\u03c1\u03b9\u03c3\u03c4\u03b9\u03ba\u03cc \u03bc\u03ad\u03c3\u03b1 \u03c3\u03c4\u03bf \u03c0\u03c1\u03c9\u03c4\u03cc\u03ba\u03bf\u03bb\u03bb\u03bf JavaScript<\/li>\n<\/ol>\n\n\n\n<p><code>);alert(1)\/\/<\/code> \u03cc\u03c0\u03bf\u03c5 <code>%27<\/code> \u03b5\u03af\u03bd\u03b1\u03b9 \u03ad\u03bd\u03b1 \u03b1\u03c0\u03bb\u03cc \u03b5\u03b9\u03c3\u03b1\u03b3\u03c9\u03b3\u03b9\u03ba\u03cc, \u03c3\u03b5<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript\">&lt;a href=&quot;javascript:change(&#039;%27);alert(1)\/\/&#039;)&quot;&gt;&kappa;\u03ac&nu;&tau;&epsilon; &kappa;&lambda;&iota;&kappa; &sigma;&tau;&omicron;&lt;\/a&gt;<\/code><\/pre>\n\n\n\n<p><code><br> <\/code><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u0396\u03c9\u03bd\u03c4\u03b1\u03bd\u03cc \u03c0\u03b1\u03c1\u03ac\u03b4\u03b5\u03b9\u03b3\u03bc\u03b1<\/h3>\n\n\n\n<figure class=\"wp-block-embed is-type-wp-embed is-provider-codesandbox wp-block-embed-codesandbox\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" title=\"\u0395\u03c5\u03c0\u03ac\u03b8\u03b5\u03b9\u03b1 XSS\" width=\"500\" height=\"750\" src=\"https:\/\/codesandbox.io\/embed\/xss-vulnerability-iedok#?secret=JCHK6BCh6d\" data-secret=\"JCHK6BCh6d\"><\/iframe>\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u039c\u03ad\u03b8\u03bf\u03b4\u03bf\u03b9 \u03ac\u03bc\u03c5\u03bd\u03b1\u03c2<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u039a\u03c9\u03b4\u03b9\u03ba\u03bf\u03c0\u03bf\u03af\u03b7\u03c3\u03b7 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd \u03bc\u03b5 \u03c7\u03c1\u03ae\u03c3\u03b7 \u03b5\u03bd\u03c3\u03c9\u03bc\u03b1\u03c4\u03c9\u03bc\u03ad\u03bd\u03c9\u03bd \u03c3\u03c5\u03bd\u03b1\u03c1\u03c4\u03ae\u03c3\u03b5\u03c9\u03bd \u03c0\u03bf\u03c5 \u03b2\u03c1\u03af\u03c3\u03ba\u03bf\u03bd\u03c4\u03b1\u03b9 \u03c3\u03b5 \u03c0\u03bf\u03bb\u03bb\u03ac <a href=\"https:\/\/thecodest.co\/el\/blog\/top-programming-languages-to-build-e-commerce\/\">\u03b3\u03bb\u03ce\u03c3\u03c3\u03b5\u03c2 \u03c0\u03c1\u03bf\u03b3\u03c1\u03b1\u03bc\u03bc\u03b1\u03c4\u03b9\u03c3\u03bc\u03bf\u03cd<\/a>.<\/li>\n\n\n\n<li>\u03a7\u03c1\u03ae\u03c3\u03b7 \u03c3\u03c5\u03c3\u03c4\u03b7\u03bc\u03ac\u03c4\u03c9\u03bd \u03c0\u03c1\u03bf\u03c4\u03cd\u03c0\u03c9\u03bd \u03bc\u03b5 \u03b1\u03c5\u03c4\u03cc\u03bc\u03b1\u03c4\u03b7 \u03ba\u03c9\u03b4\u03b9\u03ba\u03bf\u03c0\u03bf\u03af\u03b7\u03c3\u03b7. \u03a4\u03b1 \u03c0\u03b5\u03c1\u03b9\u03c3\u03c3\u03cc\u03c4\u03b5\u03c1\u03b1 \u03b1\u03c0\u03cc \u03c4\u03b1 \u03b4\u03b7\u03bc\u03bf\u03c6\u03b9\u03bb\u03ae \u03c0\u03bb\u03b1\u03af\u03c3\u03b9\u03b1 \u03c0\u03bf\u03c5 \u03c7\u03c1\u03b7\u03c3\u03b9\u03bc\u03bf\u03c0\u03bf\u03b9\u03bf\u03cd\u03bd \u03c4\u03ad\u03c4\u03bf\u03b9\u03b1 \u03c3\u03c5\u03c3\u03c4\u03ae\u03bc\u03b1\u03c4\u03b1 \u03c0\u03c1\u03bf\u03c3\u03c4\u03b1\u03c4\u03b5\u03cd\u03bf\u03c5\u03bd <a href=\"https:\/\/thecodest.co\/el\/blog\/why-us-companies-are-opting-for-polish-developers\/\">us<\/a> \u03b1\u03c0\u03cc \u03c4\u03b7\u03bd \u03ad\u03b3\u03c7\u03c5\u03c3\u03b7 XSS (<a href=\"https:\/\/thecodest.co\/el\/blog\/hire-django-developers\/\">Django<\/a>, \u03a0\u03c1\u03cc\u03c4\u03c5\u03c0\u03b1, <a href=\"https:\/\/thecodest.co\/el\/blog\/hire-vue-js-developers\/\">Vue<\/a>, <a href=\"https:\/\/thecodest.co\/el\/blog\/conditional-component-visibility-in-react\/\">React<\/a> \u03ba.\u03bb\u03c0.).<\/li>\n\n\n\n<li>\u039c\u03b7\u03bd \u03c7\u03c1\u03b7\u03c3\u03b9\u03bc\u03bf\u03c0\u03bf\u03b9\u03b5\u03af\u03c4\u03b5 \u03c3\u03c5\u03bd\u03b1\u03c1\u03c4\u03ae\u03c3\u03b5\u03b9\u03c2 \u03cc\u03c0\u03c9\u03c2 <code>eval<\/code> \u03ae <code>\u039b\u03b5\u03b9\u03c4\u03bf\u03c5\u03c1\u03b3\u03af\u03b1<\/code> \u03bc\u03b5 \u03b1\u03bd\u03b1\u03be\u03b9\u03cc\u03c0\u03b9\u03c3\u03c4\u03b1 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03b1 \u03c7\u03c1\u03b7\u03c3\u03c4\u03ce\u03bd.<\/li>\n\n\n\n<li>\u039c\u03b7\u03bd \u03c7\u03c1\u03b7\u03c3\u03b9\u03bc\u03bf\u03c0\u03bf\u03b9\u03b5\u03af\u03c4\u03b5 \u03c3\u03c5\u03bd\u03b1\u03c1\u03c4\u03ae\u03c3\u03b5\u03b9\u03c2 \u03ba\u03b1\u03b9 \u03b9\u03b4\u03b9\u03cc\u03c4\u03b7\u03c4\u03b5\u03c2 \u03c0\u03bf\u03c5 \u03b1\u03bd\u03b1\u03b8\u03ad\u03c4\u03bf\u03c5\u03bd \u03ba\u03ce\u03b4\u03b9\u03ba\u03b1 HTML \u03b1\u03c0\u03b5\u03c5\u03b8\u03b5\u03af\u03b1\u03c2 \u03c3\u03c4\u03b1 \u03c3\u03c4\u03bf\u03b9\u03c7\u03b5\u03af\u03b1 \u03c4\u03bf\u03c5 \u03b4\u03ad\u03bd\u03c4\u03c1\u03bf\u03c5 DOM, \u03c0.\u03c7, <code>innerHTML<\/code>, <code>outerHTML<\/code>, <code>insertAdjacentHTML<\/code>, <code>ocument.write<\/code>. \u0391\u03bd\u03c4' \u03b1\u03c5\u03c4\u03bf\u03cd, \u03bc\u03c0\u03bf\u03c1\u03b5\u03af\u03c4\u03b5 \u03bd\u03b1 \u03c7\u03c1\u03b7\u03c3\u03b9\u03bc\u03bf\u03c0\u03bf\u03b9\u03ae\u03c3\u03b5\u03c4\u03b5 \u03c3\u03c5\u03bd\u03b1\u03c1\u03c4\u03ae\u03c3\u03b5\u03b9\u03c2 \u03c0\u03bf\u03c5 \u03b1\u03bd\u03b1\u03b8\u03ad\u03c4\u03bf\u03c5\u03bd \u03ba\u03b5\u03af\u03bc\u03b5\u03bd\u03bf \u03b1\u03c0\u03b5\u03c5\u03b8\u03b5\u03af\u03b1\u03c2 \u03c3\u03b5 \u03b1\u03c5\u03c4\u03ac \u03c4\u03b1 \u03c3\u03c4\u03bf\u03b9\u03c7\u03b5\u03af\u03b1, \u03cc\u03c0\u03c9\u03c2 \u03b7 <code>textContent<\/code> \u03ae <code>innerText<\/code>.<\/li>\n\n\n\n<li>\u039d\u03b1 \u03b5\u03af\u03c3\u03c4\u03b5 \u03c0\u03c1\u03bf\u03c3\u03b5\u03ba\u03c4\u03b9\u03ba\u03bf\u03af \u03cc\u03c4\u03b1\u03bd \u03b1\u03bd\u03b1\u03ba\u03b1\u03c4\u03b5\u03c5\u03b8\u03cd\u03bd\u03b5\u03c4\u03b5 \u03c4\u03bf\u03bd \u03c7\u03c1\u03ae\u03c3\u03c4\u03b7 \u03c3\u03b5 \u03bc\u03b9\u03b1 \u03b4\u03b9\u03b5\u03cd\u03b8\u03c5\u03bd\u03c3\u03b7 URL \u03c0\u03bf\u03c5 \u03b2\u03c1\u03af\u03c3\u03ba\u03b5\u03c4\u03b1\u03b9 \u03c5\u03c0\u03cc \u03c4\u03bf\u03bd \u03ad\u03bb\u03b5\u03b3\u03c7\u03cc \u03c4\u03bf\u03c5. \u039a\u03af\u03bd\u03b4\u03c5\u03bd\u03bf\u03c2 \u03ad\u03b3\u03c7\u03c5\u03c3\u03b7\u03c2 <code>location = 'javascript('XSS')'<\/code>.<\/li>\n\n\n\n<li>\u03a6\u03b9\u03bb\u03c4\u03c1\u03ac\u03c1\u03b5\u03c4\u03b5 \u03c4\u03b7\u03bd HTML \u03c7\u03c1\u03b7\u03c3\u03b9\u03bc\u03bf\u03c0\u03bf\u03b9\u03ce\u03bd\u03c4\u03b1\u03c2 \u03b2\u03b9\u03b2\u03bb\u03b9\u03bf\u03b8\u03ae\u03ba\u03b5\u03c2 \u03cc\u03c0\u03c9\u03c2 <code>DOMPurify<\/code>.<\/li>\n\n\n\n<li>\u039d\u03b1 \u03b5\u03af\u03c3\u03c4\u03b5 \u03c0\u03c1\u03bf\u03c3\u03b5\u03ba\u03c4\u03b9\u03ba\u03bf\u03af \u03bc\u03b5 \u03c4\u03bf \u03b1\u03bd\u03ad\u03b2\u03b1\u03c3\u03bc\u03b1 <code>.html<\/code> \u03ae <code>.svg<\/code> \u03b1\u03c1\u03c7\u03b5\u03af\u03b1. \u039c\u03c0\u03bf\u03c1\u03b5\u03af\u03c4\u03b5 \u03bd\u03b1 \u03b4\u03b7\u03bc\u03b9\u03bf\u03c5\u03c1\u03b3\u03ae\u03c3\u03b5\u03c4\u03b5 \u03ad\u03bd\u03b1\u03bd \u03be\u03b5\u03c7\u03c9\u03c1\u03b9\u03c3\u03c4\u03cc \u03c4\u03bf\u03bc\u03ad\u03b1 \u03b1\u03c0\u03cc \u03c4\u03bf\u03bd \u03bf\u03c0\u03bf\u03af\u03bf \u03b8\u03b1 \u03b5\u03be\u03c5\u03c0\u03b7\u03c1\u03b5\u03c4\u03bf\u03cd\u03bd\u03c4\u03b1\u03b9 \u03c4\u03b1 \u03b1\u03bd\u03b5\u03b2\u03b1\u03c3\u03bc\u03ad\u03bd\u03b1 \u03b1\u03c1\u03c7\u03b5\u03af\u03b1.<\/li>\n\n\n\n<li>\u03a7\u03c1\u03b7\u03c3\u03b9\u03bc\u03bf\u03c0\u03bf\u03b9\u03ae\u03c3\u03c4\u03b5 \u03c4\u03bf <code>\u03a0\u03bf\u03bb\u03b9\u03c4\u03b9\u03ba\u03ae \u03b1\u03c3\u03c6\u03ac\u03bb\u03b5\u03b9\u03b1\u03c2 \u03c0\u03b5\u03c1\u03b9\u03b5\u03c7\u03bf\u03bc\u03ad\u03bd\u03bf\u03c5<\/code> \u03bc\u03b7\u03c7\u03b1\u03bd\u03b9\u03c3\u03bc\u03cc.<\/li>\n\n\n\n<li> <span style=\"font-size: revert; color: initial; font-family: -apple-system, BlinkMacSystemFont, &quot;Segoe UI&quot;, Roboto, Oxygen-Sans, Ubuntu, Cantarell, &quot;Helvetica Neue&quot;, sans-serif;\">\u03a1\u03af\u03be\u03c4\u03b5 \u03bc\u03b9\u03b1 \u03bc\u03b1\u03c4\u03b9\u03ac \u03c3\u03c4\u03b1 \u03c6\u03af\u03bb\u03c4\u03c1\u03b1 anti-XSS \u03c0\u03bf\u03c5 \u03b5\u03af\u03bd\u03b1\u03b9 \u03b5\u03bd\u03c3\u03c9\u03bc\u03b1\u03c4\u03c9\u03bc\u03ad\u03bd\u03b1 \u03c3\u03c4\u03b1 \u03c0\u03b9\u03bf \u03b4\u03b7\u03bc\u03bf\u03c6\u03b9\u03bb\u03ae \u03c0\u03c1\u03bf\u03b3\u03c1\u03ac\u03bc\u03bc\u03b1\u03c4\u03b1 \u03c0\u03b5\u03c1\u03b9\u03ae\u03b3\u03b7\u03c3\u03b7\u03c2.<\/span> <p><strong>\u0391\u03bd \u03b2\u03c1\u03ae\u03ba\u03b1\u03c4\u03b5 \u03b1\u03c5\u03c4\u03cc \u03c4\u03bf \u03ac\u03c1\u03b8\u03c1\u03bf \u03b5\u03bd\u03b4\u03b9\u03b1\u03c6\u03ad\u03c1\u03bf\u03bd, \u03b1\u03ba\u03bf\u03bb\u03bf\u03c5\u03b8\u03ae\u03c3\u03c4\u03b5 \u03c4\u03bf\u03bd Lukasz \u03c3\u03c4\u03bf Github:<\/strong> https:\/\/github.com\/twistezo<\/p> <\/li>\n<\/ol>\n\n\n\n<p><strong>\u0394\u03b9\u03b1\u03b2\u03ac\u03c3\u03c4\u03b5 \u03c0\u03b5\u03c1\u03b9\u03c3\u03c3\u03cc\u03c4\u03b5\u03c1\u03b1:<\/strong><\/p>\n\n\n\n<p><a href=\"https:\/\/thecodest.co\/blog\/data-fetching-strategies-in-nextjs\/\">\u03a3\u03c4\u03c1\u03b1\u03c4\u03b7\u03b3\u03b9\u03ba\u03ad\u03c2 \u03ac\u03bd\u03c4\u03bb\u03b7\u03c3\u03b7\u03c2 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd \u03c3\u03c4\u03bf NextJS<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/thecodest.co\/blog\/rails-api-cors-dash-of-consciousness\/\">Rails API &amp; CORS. \u039c\u03b9\u03b1 \u03c0\u03b9\u03bd\u03b5\u03bb\u03b9\u03ac \u03c3\u03c5\u03bd\u03b5\u03af\u03b4\u03b7\u03c3\u03b7\u03c2<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/thecodest.co\/blog\/why-you-should-probably-use-typescript\/\">\u0393\u03b9\u03b1\u03c4\u03af \u03c0\u03c1\u03ad\u03c0\u03b5\u03b9 (\u03c0\u03b9\u03b8\u03b1\u03bd\u03ce\u03c2) \u03bd\u03b1 \u03c7\u03c1\u03b7\u03c3\u03b9\u03bc\u03bf\u03c0\u03bf\u03b9\u03ae\u03c3\u03b5\u03c4\u03b5 \u03c4\u03b7\u03bd Typescript;<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>\u039f\u03b9 \u03b5\u03c0\u03b9\u03b8\u03ad\u03c3\u03b5\u03b9\u03c2 XSS \u03b5\u03c0\u03b9\u03c4\u03c1\u03ad\u03c0\u03bf\u03c5\u03bd \u03c3\u03c4\u03bf\u03c5\u03c2 \u03b5\u03c0\u03b9\u03c4\u03b9\u03b8\u03ad\u03bc\u03b5\u03bd\u03bf\u03c5\u03c2 \u03bd\u03b1 \u03b5\u03b9\u03c3\u03ac\u03b3\u03bf\u03c5\u03bd \u03c3\u03b5\u03bd\u03ac\u03c1\u03b9\u03b1 \u03b1\u03c0\u03cc \u03c4\u03b7\u03bd \u03c0\u03bb\u03b5\u03c5\u03c1\u03ac \u03c4\u03bf\u03c5 \u03c0\u03b5\u03bb\u03ac\u03c4\u03b7 \u03c3\u03b5 \u03b9\u03c3\u03c4\u03bf\u03c3\u03b5\u03bb\u03af\u03b4\u03b5\u03c2 \u03c0\u03bf\u03c5 \u03c0\u03c1\u03bf\u03b2\u03ac\u03bb\u03bb\u03bf\u03bd\u03c4\u03b1\u03b9 \u03b1\u03c0\u03cc \u03ac\u03bb\u03bb\u03bf\u03c5\u03c2 \u03c7\u03c1\u03ae\u03c3\u03c4\u03b5\u03c2. \u03a4\u03b1 \u03ba\u03cd\u03c1\u03b9\u03b1 \u03b1\u03c0\u03bf\u03c4\u03b5\u03bb\u03ad\u03c3\u03bc\u03b1\u03c4\u03b1 \u03b1\u03c5\u03c4\u03ae\u03c2 \u03c4\u03b7\u03c2 \u03b5\u03c5\u03c0\u03ac\u03b8\u03b5\u03b9\u03b1\u03c2 \u03b5\u03af\u03bd\u03b1\u03b9 \u03b7 \u03b4\u03c5\u03bd\u03b1\u03c4\u03cc\u03c4\u03b7\u03c4\u03b1 \u03b5\u03ba\u03c4\u03ad\u03bb\u03b5\u03c3\u03b7\u03c2 \u03bf\u03c0\u03bf\u03b9\u03c9\u03bd\u03b4\u03ae\u03c0\u03bf\u03c4\u03b5 \u03b5\u03bd\u03b5\u03c1\u03b3\u03b5\u03b9\u03ce\u03bd \u03c3\u03c4\u03bf \u03c0\u03bb\u03b1\u03af\u03c3\u03b9\u03bf \u03c4\u03bf\u03c5 \u03c3\u03c5\u03bd\u03b4\u03b5\u03b4\u03b5\u03bc\u03ad\u03bd\u03bf\u03c5 \u03c7\u03c1\u03ae\u03c3\u03c4\u03b7 \u03ba\u03b1\u03b9 \u03b7 \u03b1\u03bd\u03ac\u03b3\u03bd\u03c9\u03c3\u03b7 \u03bf\u03c0\u03bf\u03b9\u03c9\u03bd\u03b4\u03ae\u03c0\u03bf\u03c4\u03b5 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd \u03c3\u03c4\u03bf \u03c0\u03bb\u03b1\u03af\u03c3\u03b9\u03bf \u03c4\u03bf\u03c5 \u03c3\u03c5\u03bd\u03b4\u03b5\u03b4\u03b5\u03bc\u03ad\u03bd\u03bf\u03c5 \u03c7\u03c1\u03ae\u03c3\u03c4\u03b7.<\/p>","protected":false},"author":2,"featured_media":3809,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[8],"tags":[],"class_list":["post-3810","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-software-development"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Web app security - XSS vulnerability - The 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