CVE-2026-84739
Received Received - Intake

Cross-Site Scripting in GitLab CE/EE

Publication date: 2026-09-29

Last updated on: 2026-09-29

Assigner: GitLab Inc.

Description
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 13.11 before 19.2.7, 19.3 before 19.3.3, and 19.4 before 19.4.1 that under certain conditions could have allowed an authenticated user to execute arbitrary JavaScript in the context of another user's browser session due to improper sanitization of path components in the merge request diff viewer.

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Meta Information

Published
2026-09-29
Last Modified
2026-09-29
Generated
2026-09-29
AI Q&A
2026-09-29
EPSS Evaluated
N/A
NVD
CVE-2026-84739
EUVD
EUVD-2026-88687

Affected Vendors & Products

Showing 12 associated CPEs
Vendor Product Version / Range
gitlab gitlab_ce From 13.11 (inc) to 19.2.7 (exc)
gitlab gitlab_ee From 13.11 (inc) to 19.2.7 (exc)
gitlab gitlab_ce From 19.3 (inc) to 19.3.3 (exc)
gitlab gitlab_ee From 19.3 (inc) to 19.3.3 (exc)
gitlab gitlab_ce From 19.4 (inc) to 19.4.1 (exc)
gitlab gitlab_ee From 19.4 (inc) to 19.4.1 (exc)
gitlab gitlab_ce From 19.2.0 (inc) to 19.2.7 (exc)
gitlab gitlab_ee From 19.2.0 (inc) to 19.2.7 (exc)
gitlab gitlab_ce From 19.3.0 (inc) to 19.3.3 (exc)
gitlab gitlab_ee From 19.3.0 (inc) to 19.3.3 (exc)
gitlab gitlab_ce From 19.4.0 (inc) to 19.4.1 (exc)
gitlab gitlab_ee From 19.4.0 (inc) to 19.4.1 (exc)

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.

Attack-Flow Graph

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Executive Summary

This vulnerability in GitLab CE/EE versions 13.11 before 19.2.7, 19.3 before 19.3.3, and 19.4 before 19.4.1 allows an authenticated user to execute arbitrary JavaScript in another user's browser session. This occurs due to improper sanitization of path components in the merge request diff viewer.

Impact Analysis

An attacker could exploit this to perform actions on behalf of other users, steal sensitive data, or manipulate user sessions. This could lead to unauthorized access, data breaches, or account takeovers.

Compliance Impact

This vulnerability could lead to unauthorized data access or exposure, violating GDPR's data protection requirements and HIPAA's safeguards for protected health information. Non-compliance may result in legal penalties and reputational damage.

Mitigation Strategies

Upgrade GitLab to a patched version: 19.2.7, 19.3.3, or 19.4.1 or later to address the vulnerability.

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