{"id":8515,"date":"2026-05-25T09:27:39","date_gmt":"2026-05-25T07:27:39","guid":{"rendered":"https:\/\/mybox.com\/help\/?post_type=manual_kb&#038;p=8515"},"modified":"2026-06-15T00:09:38","modified_gmt":"2026-06-14T22:09:38","slug":"atacuri-cross-site-scripting-xss","status":"publish","type":"manual_kb","link":"https:\/\/mybox.com\/help\/ro\/knowledgebase\/cross-site-scripting-xss-attacks\/","title":{"rendered":"Cum func\u021bioneaz\u0103 un atac de tip Cross-Site Scripting (XSS)?"},"content":{"rendered":"<div class=\"translation-block translation-block-merged\">\n<p class=\"wp-block-paragraph\">Cross-Site Scripting (XSS) is one of the most common web application vulnerabilities. It occurs when an attacker manages to inject malicious client-side code\u2014usually JavaScript\u2014into a website that is later executed in another user&#8217;s browser.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">XSS attacks can be used to steal session cookies, impersonate users, modify website content, redirect visitors to malicious websites, or perform actions on behalf of authenticated users.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/cross-site-scripting-xss-attacks\/#How_Does_XSS_Work\" >How Does XSS Work?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/cross-site-scripting-xss-attacks\/#Types_of_XSS_Attacks\" >Types of XSS Attacks<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/cross-site-scripting-xss-attacks\/#Reflected_XSS\" >Reflected XSS<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/cross-site-scripting-xss-attacks\/#Stored_XSS\" >Stored XSS<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/cross-site-scripting-xss-attacks\/#DOM-Based_XSS\" >DOM-Based XSS<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/cross-site-scripting-xss-attacks\/#What_Can_an_Attacker_Do_with_XSS\" >What Can an Attacker Do with XSS?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/cross-site-scripting-xss-attacks\/#How_to_Protect_Against_XSS\" >How to Protect Against XSS<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/cross-site-scripting-xss-attacks\/#Validate_User_Input\" >Validate User Input<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/cross-site-scripting-xss-attacks\/#Escape_Output\" >Escape Output<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/cross-site-scripting-xss-attacks\/#Use_a_Content_Security_Policy_CSP\" >Use a Content Security Policy (CSP)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/cross-site-scripting-xss-attacks\/#Keep_Software_Updated\" >Keep Software Updated<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/cross-site-scripting-xss-attacks\/#Use_a_Web_Application_Firewall_WAF\" >Use a Web Application Firewall (WAF)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/cross-site-scripting-xss-attacks\/#Secure_Session_Cookies\" >Secure Session Cookies<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/cross-site-scripting-xss-attacks\/#User_Best_Practices\" >User Best Practices<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/cross-site-scripting-xss-attacks\/#Summary\" >Summary<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Does_XSS_Work\"><\/span>How Does XSS Work?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<\/div>\n\n<div id=\"mybox-1038265388\" class=\"mybox-content mybox-entity-placement\"><div class=\"early-access-banner-inpost\">\r\n  <div class=\"banner-left-inpost\">\r\n    <div class=\"icon-box-inpost\">\r\n      <img decoding=\"async\" src=\"https:\/\/mybox.com\/help\/wp-content\/uploads\/2026\/02\/square-info-icon.svg\" alt=\"Info\">\r\n    <\/div>\r\n    <div class=\"text-box-inpost\">\r\n      <span class=\"label-inpost\"><span class=\"translation-block translation-block-banner-text\">Acces timpuriu<\/span><\/span>\r\n      <h4><span class=\"translation-block translation-block-banner-text\">Mai ave\u021bi nevoie de ajutor?<\/span><\/h4>\r\n      <p><span class=\"translation-block translation-block-banner-text\">Contacta\u021bi echipa noastr\u0103 de servicii pentru clien\u021bi.<\/span><\/p>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <div class=\"banner-right-inpost\">\r\n    <a href=\"https:\/\/panel.mybox.com\/helpdesk2\/v\/list\/\" class=\"banner-button-inpost\"><span class=\"translation-block translation-block-banner-text\">Trimite mesaj<\/span><\/a>\r\n  <\/div>\r\n<\/div><\/div>\n\n<div class=\"translation-block translation-block-merged\"><p class=\"wp-block-paragraph\">An XSS vulnerability appears when a website accepts user-supplied content and displays it without properly validating or sanitizing it.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For example, if a website allows visitors to post comments and does not properly filter HTML or JavaScript code, an attacker may submit malicious code that is executed whenever another visitor views the page.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Instead of displaying harmless text, the browser executes the injected script as if it were legitimate website content.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Types_of_XSS_Attacks\"><\/span>Types of XSS Attacks<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Reflected_XSS\"><\/span>Reflected XSS<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Reflected XSS occurs when malicious code is included in a URL or request and immediately reflected back by the website.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For example, an attacker may send a specially crafted link containing malicious JavaScript. If a victim clicks the link and the website displays the input without proper filtering, the code executes in the victim&#8217;s browser.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This type of attack typically requires user interaction, such as clicking a malicious link.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Stored_XSS\"><\/span>Stored XSS<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Stored XSS occurs when malicious code is permanently stored by the application, such as in:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Blog comments<\/li>\n\n\n\n<li>Forum posts<\/li>\n\n\n\n<li>User profiles<\/li>\n\n\n\n<li>Contact form submissions<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Whenever another user loads the affected page, the malicious script is executed automatically.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Stored XSS is generally considered more dangerous because it can affect multiple users without requiring them to click a specially crafted link.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"DOM-Based_XSS\"><\/span>DOM-Based XSS<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">DOM-Based XSS occurs entirely within the user&#8217;s browser when JavaScript on the page processes untrusted input and inserts it into the page&#8217;s Document Object Model (DOM).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In this scenario, the vulnerable code exists in the client-side application rather than on the server itself.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Can_an_Attacker_Do_with_XSS\"><\/span>What Can an Attacker Do with XSS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A successful XSS attack can be used to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Steal session cookies<\/li>\n\n\n\n<li>Hijack user accounts<\/li>\n\n\n\n<li>Capture login credentials<\/li>\n\n\n\n<li>Redirect users to malicious websites<\/li>\n\n\n\n<li>Display fake content or forms<\/li>\n\n\n\n<li>Perform actions on behalf of authenticated users<\/li>\n\n\n\n<li>Deliver malware or phishing content<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The impact depends on the permissions of the affected user and the functionality of the website.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_to_Protect_Against_XSS\"><\/span>How to Protect Against XSS<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Validate_User_Input\"><\/span>Validate User Input<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">All user-supplied data should be treated as untrusted and validated before being processed or displayed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Escape_Output\"><\/span>Escape Output<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Data displayed on web pages should be properly escaped according to the context in which it appears (HTML, JavaScript, CSS, or URLs).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Use_a_Content_Security_Policy_CSP\"><\/span>Use a Content Security Policy (CSP)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A Content Security Policy (CSP) helps reduce the impact of XSS vulnerabilities by restricting which scripts can be executed by the browser.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Keep_Software_Updated\"><\/span>Keep Software Updated<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Regularly update your CMS, plugins, themes, frameworks, and libraries to ensure known vulnerabilities are patched.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Use_a_Web_Application_Firewall_WAF\"><\/span>Use a Web Application Firewall (WAF)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A WAF can help detect and block malicious requests before they reach the application.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Secure_Session_Cookies\"><\/span>Secure Session Cookies<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Using security flags such as <code>HttpOnly<\/code>, <code>Secure<\/code>, and <code>SameSite<\/code> can reduce the risk of session theft if an XSS vulnerability is exploited.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"User_Best_Practices\"><\/span>User Best Practices<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">While website owners are primarily responsible for preventing XSS vulnerabilities, users can reduce their risk by:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Avoiding suspicious links<\/li>\n\n\n\n<li>Being cautious with unexpected messages or emails<\/li>\n\n\n\n<li>Keeping browsers up to date<\/li>\n\n\n\n<li>Using browser security features and extensions<\/li>\n\n\n\n<li>Avoiding websites that appear untrustworthy<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Summary\"><\/span>Summary<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Cross-Site Scripting (XSS) is a web application vulnerability that allows attackers to inject malicious code into websites viewed by other users. The most common forms are Reflected XSS, Stored XSS, and DOM-Based XSS. Proper input validation, output escaping, Content Security Policy implementation, software updates, and Web Application Firewalls are essential defenses against this type of attack.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n<\/div>","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"template":"","format":"standard","manualknowledgebasecat":[10],"manual_kb_tag":[6286,6637,6651,7300,7301,7302,7303,7304,7305,7306],"class_list":["post-8515","manual_kb","type-manual_kb","status-publish","format-standard","hentry","manualknowledgebasecat-safety","manual_kb_tag-input-validation","manual_kb_tag-web-application-firewall","manual_kb_tag-cross-site-scripting","manual_kb_tag-reflected-cross-site-scripting","manual_kb_tag-stored-cross-site-scripting","manual_kb_tag-client-side-scripting","manual_kb_tag-javascript-injection","manual_kb_tag-input-sanitization","manual_kb_tag-output-escaping","manual_kb_tag-content-security-policy"],"_links":{"self":[{"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/manual_kb\/8515","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/manual_kb"}],"about":[{"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/types\/manual_kb"}],"author":[{"embeddable":true,"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/users\/1"}],"version-history":[{"count":2,"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/manual_kb\/8515\/revisions"}],"predecessor-version":[{"id":8516,"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/manual_kb\/8515\/revisions\/8516"}],"wp:attachment":[{"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/media?parent=8515"}],"wp:term":[{"taxonomy":"manualknowledgebasecat","embeddable":true,"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/manualknowledgebasecat?post=8515"},{"taxonomy":"manual_kb_tag","embeddable":true,"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/manual_kb_tag?post=8515"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}