CVE-2026-92883 in GitLab
Summary
by MITRE • 10/13/2026
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 19.1 before 19.2.8, 19.3 before 19.3.5, and 19.4 before 19.4.2 that, under certain conditions, could have allowed an authenticated user to execute arbitrary JavaScript in the context of other users' browser sessions via a specially crafted repository, due to improper sanitization of HTML attributes in syntax-highlighted output.
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Analysis
by VulDB Data Team • 10/13/2026
The vulnerability identified as CVE-2024-7569 represents a significant security flaw within GitLab Community and Enterprise Editions across multiple version branches prior to their respective remediation releases. Specifically, this issue impacts versions 19.1 through 19.2.8, 19.3 through 19.3.5, and 19.4 before 19.4.2. The core of the vulnerability lies in the improper sanitization of HTML attributes within syntax-highlighted code output. When users view repository files that contain specific constructs, GitLab’s frontend rendering engine processes these elements without adequately stripping or escaping dangerous attribute values. This failure allows an authenticated user to inject malicious JavaScript payloads into the rendered page context. Because the injection occurs during the display phase rather than at input storage, it bypasses many traditional server-side validation checks and relies on client-side execution mechanisms inherent in modern web applications.
From a technical perspective, this flaw is classified under CWE-79, which denotes Improper Neutralization of Input During Web Page Generation commonly known as Cross-Site Scripting or XSS. More specifically, the vulnerability aligns with CWE-80 due to its reliance on HTML attribute injection vectors rather than simple script tag insertion. The attacker crafts a repository containing code snippets where syntax highlighting logic interprets certain characters as part of an HTML structure but fails to properly escape attributes that could contain event handlers such as onclick or onload. When another user views this content, the browser executes the embedded JavaScript within the context of the victim’s active session. This mechanism exploits the trust relationship between the GitLab instance and its authenticated users, turning a collaborative code review feature into an attack vector for client-side compromise.
The operational impact of this vulnerability is severe due to the privileged nature of the required access level. Unlike unauthenticated XSS attacks that target anonymous visitors, CVE-2024-7569 requires authentication, meaning only registered and logged-in users can exploit it. However, within a GitLab instance, authenticated status grants access to sensitive project data, internal communications, and potentially integration tokens depending on the user’s role. An attacker leveraging this flaw could perform actions such as stealing session cookies or CSRF tokens, redirecting victims to phishing sites mimicking the GitLab interface, or manipulating the DOM to alter displayed code snippets maliciously. In environments where developers frequently review each other’s pull requests and commits, an adversary with access can silently compromise colleagues by embedding payloads in seemingly innocuous code changes that are automatically rendered upon viewing.
This vulnerability maps directly to several techniques within the MITRE ATT&CK framework for enterprise security. It corresponds primarily to T1059.007, which covers JavaScript execution as a method of client-side script injection. Furthermore, if used to steal credentials or session tokens, it aligns with T1539, indicating Web Session Cookie Harvesting. The attack vector also reflects T1189, Drive-by Compromise, although in this context, the compromise is limited to browser-based actions rather than full system infection unless combined with other exploits. Understanding these mappings helps security teams prioritize detection rules and monitor for anomalous JavaScript execution patterns originating from GitLab web interfaces within their network traffic logs.
To mitigate the risks associated with CVE-2024-7569, organizations must immediately upgrade their GitLab instances to patched versions. For those running version 19.1.x, this means upgrading to at least 19.2.8. Users on the 19.3 branch should move to 19.3.5 or later, while those on 19.4 must upgrade to 19.4.2 or newer. Until upgrades are performed, administrators can implement temporary compensating controls such as restricting access to GitLab instances via IP whitelisting if the service is exposed externally, although this does not mitigate insider threats from authenticated users within a trusted network segment. Additionally, enabling Content Security Policy headers with strict script-src directives that restrict execution of inline scripts can significantly reduce the impact of successful XSS attempts by preventing arbitrary JavaScript injection even if sanitization fails. Regular security audits and code review training should also be reinforced to ensure developers are aware of how their contributions might inadvertently introduce client-side vulnerabilities into shared repositories.