CVE-2026-92883
Received Received - Intake

Authenticated JavaScript Execution in GitLab CE/EE via Syntax Highlighting

Publication date: 2026-10-13

Last updated on: 2026-10-13

Assigner: GitLab Inc.

Description
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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Meta Information

Published
2026-10-13
Last Modified
2026-10-13
Generated
2026-10-13
AI Q&A
2026-10-13
EPSS Evaluated
N/A
NVD
CVE-2026-92883
EUVD
EUVD-2026-98215

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
GitLab GitLab 19.1
GitLab GitLab 19.3
GitLab GitLab 19.4

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

This vulnerability in GitLab CE/EE allows an authenticated user to execute arbitrary JavaScript in other users' browser sessions by exploiting improperly sanitized HTML attributes in syntax-highlighted output from a specially crafted repository.

Detection Guidance

This vulnerability involves improper HTML sanitization in GitLab's syntax-highlighted output, allowing JavaScript execution in other users' sessions. To detect it, check GitLab versions for affected releases (19.1.x before 19.2.8, 19.3.x before 19.3.5, or 19.4.x before 19.4.2). Use commands like 'gitlab-rake gitlab:env:info' to verify version or inspect logs for suspicious repository activities.

Impact Analysis

An attacker could steal sensitive data, perform actions on behalf of other users, or take control of user sessions if they trick a user into viewing the malicious repository.

Compliance Impact

This vulnerability could lead to unauthorized access to personal or sensitive data, potentially violating GDPR (data protection) and HIPAA (health information privacy) requirements if exploited.

Mitigation Strategies

Upgrade GitLab to a patched version: 19.2.8, 19.3.5, or 19.4.2 or later. Remove access for any potentially affected users until the update is applied.

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