{"id":53558,"date":"2025-06-19T04:39:26","date_gmt":"2025-06-19T04:39:26","guid":{"rendered":""},"modified":"2025-10-21T10:42:47","modified_gmt":"2025-10-21T16:42:47","slug":"cve-2025-2254-cross-site-scripting-vulnerability-in-gitlab-ce-ee","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-2254-cross-site-scripting-vulnerability-in-gitlab-ce-ee\/","title":{"rendered":"<strong>CVE-2025-2254: Cross-Site Scripting Vulnerability in GitLab CE\/EE<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>In this post, we&#8217;ll discuss and delve into the details of a critical vulnerability, CVE-2025-2254, which affects GitLab CE\/EE. This issue is prevalent in all versions from 17.9 before 17.10.8, 17.11 before 17.11.4, and 18.0 before 18.0.2. The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-21475-critical-memory-corruption-vulnerability-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"59928\">vulnerability&#8217;s severity lies in its potential<\/a> to allow Cross-Site Scripting (XSS) attacks due to improper output encoding in the snippet viewer functionality of GitLab. This <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-4954-critical-file-upload-vulnerability-in-axle-demo-importer-wordpress-plugin\/\"  data-wpil-monitor-id=\"60717\">vulnerability is of significant importance<\/a> because an attacker exploiting it could potentially compromise the system or leak sensitive data.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-2254<br \/>\nSeverity: High (8.7 CVSS Score)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: Low<br \/>\nUser Interaction: Required<br \/>\nImpact: System compromise or <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49796-exploiting-libxml2-memory-corruption-for-denial-of-service-and-data-leakage\/\"  data-wpil-monitor-id=\"61809\">data leakage upon successful exploit<\/a><\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-1967972659\" class=\"ameeb-content-2 ameeb-entity-placement\"><div style=\"border-left: 4px solid #555; padding-left: 20px; margin: 48px 0; font-family: Roboto, sans-serif; color: #ffffff; line-height: 1.6; max-width: 700px;\">\r\n  <h2 style=\"margin-top: 0; font-size: 20px; font-weight: 600; display: flex; align-items: center;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"display: inline-flex; align-items: center; margin-right: 8px;\">\r\n      <img decoding=\"async\" src=\"https:\/\/www.ameeba.com\/blog\/wp-content\/uploads\/2025\/10\/Best-App-icon-Ameeba.png\" alt=\"Ameeba Chat Icon\" style=\"width: 40px; height: 40px;\" \/>\r\n    <\/a>\r\n    A new way to communicate\r\n  <\/h2>\r\n\r\n  <p style=\"margin-bottom: 12px;\">\r\n    Ameeba Chat is built on encrypted identity, not personal profiles.\r\n  <\/p>\r\n\r\n  <p style=\"margin-bottom: 16px;\">\r\n    Message, call, share files, and coordinate with identities kept separate.\r\n  <\/p>\r\n\r\n  <ul style=\"list-style: none; padding-left: 0; margin-bottom: 20px;\">\r\n    <li>\u2022 Encrypted identity<\/li>\r\n    <li>\u2022 Ameeba Chat authenticates access<\/li>\r\n    <li>\u2022 Aliases and categories<\/li>\r\n    <li>\u2022 End-to-end encrypted chat, calls, and files<\/li>\r\n    <li>\u2022 Secure notes for sensitive information<\/li>\r\n  <\/ul>\r\n\r\n  <p style=\"font-style: italic; font-weight: 600; margin-bottom: 24px;\">\r\n    Private communication, rethought.\r\n  <\/p>\r\n\r\n  <div style=\"display: flex; flex-wrap: wrap; gap: 12px;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\/download\" style=\"background-color: #ffffff; color: #000000; padding: 10px 20px; text-decoration: none; border-radius: 6px; font-weight: 500;\">Download Ameeba Chat<\/a>\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"border: 1px solid #ffffff; color: #ffffff; padding: 10px 20px; text-decoration: none; border-radius: 6px; font-weight: 500;\">Learn More<\/a>\r\n  <\/div>\r\n<\/div>\r\n<\/div>\n<p>Product | Affected Versions<\/p>\n<p>GitLab CE | 17.9 before 17.10.8<br \/>\nGitLab EE | 17.11 before 17.11.4, 18.0 before 18.0.2<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The exploit takes advantage of the improper output encoding in the snippet viewer functionality within <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-6454-authenticated-user-exploit-in-gitlab-ce-ee-through-proxy-environments\/\"  data-wpil-monitor-id=\"90725\">GitLab<\/a>. An attacker, by crafting a malicious snippet containing malicious script, can exploit this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47110-high-severity-stored-cross-site-scripting-xss-vulnerability-in-adobe-commerce\/\"  data-wpil-monitor-id=\"60423\">vulnerability to initiate a Cross-Site Scripting<\/a> (XSS) attack. When an unsuspecting user views this malicious snippet, the embedded <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-6512-script-execution-with-admin-privileges-on-brain2-server\/\"  data-wpil-monitor-id=\"63467\">script is executed<\/a> in the context of the user&#8217;s session. This could <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-40912-critical-vulnerability-in-cryptx-for-perl-allows-potential-system-compromise\/\"  data-wpil-monitor-id=\"61811\">potentially allow<\/a> the attacker to take over the user&#8217;s session, impersonate the user, and perform actions on their behalf.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-1490907731\" class=\"ameeb-content ameeb-entity-placement\"><div class=\"poptin-embedded\" data-id=\"f6b387694f681\"><\/div>\r\n\r\n\r\n\r\n\r\n\r\n<\/div>\n<p>Here&#8217;s a conceptual example of how the vulnerability might be exploited. This is an HTTP request where an attacker submits a malicious snippet to the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49216-critical-authentication-bypass-vulnerability-in-trend-micro-endpoint-encryption-policyserver\/\"  data-wpil-monitor-id=\"62690\">vulnerable endpoint<\/a>:<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/snippets\/create HTTP\/1.1\nHost: gitlab.example.com\nContent-Type: application\/json\n{ &quot;snippet_code&quot;: &quot;&lt;script&gt;malicious_code_here&lt;\/script&gt;&quot; }<\/code><\/pre>\n<p>The malicious snippet contains a script tag with malicious <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-1331-ibm-cics-local-user-code-execution-vulnerability\/\"  data-wpil-monitor-id=\"59962\">code that could be executed when a user<\/a> views the snippet.<\/p>\n<p><strong>Mitigation Guidance<\/strong><\/p>\n<p>The best course of <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49013-code-injection-vulnerability-in-wilderforge-projects-due-to-unsafe-github-actions-usage\/\"  data-wpil-monitor-id=\"60093\">action to mitigate this vulnerability<\/a> is to apply the vendor-provided patch. GitLab has <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-35115-critical-system-package-download-vulnerability-in-agiloft-release-28\/\"  data-wpil-monitor-id=\"85339\">released patches for the affected versions which can be downloaded<\/a> and applied. In cases where patching isn&#8217;t immediately feasible, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) could serve as temporary mitigation. These tools can help <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-45984-critical-command-injection-vulnerability-detected-in-blink-routers\/\"  data-wpil-monitor-id=\"61810\">detect and block attempts to exploit this vulnerability<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview In this post, we&#8217;ll discuss and delve into the details of a critical vulnerability, CVE-2025-2254, which affects GitLab CE\/EE. This issue is prevalent in all versions from 17.9 before 17.10.8, 17.11 before 17.11.4, and 18.0 before 18.0.2. The vulnerability&#8217;s severity lies in its potential to allow Cross-Site Scripting (XSS) attacks due to improper output [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[102],"product":[],"attack_vector":[81],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-53558","post","type-post","status-publish","format-standard","hentry","category-uncategorized","vendor-gitlab","attack_vector-xss"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/53558","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/comments?post=53558"}],"version-history":[{"count":10,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/53558\/revisions"}],"predecessor-version":[{"id":83670,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/53558\/revisions\/83670"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=53558"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=53558"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=53558"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=53558"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=53558"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=53558"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=53558"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=53558"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=53558"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}