High severity8.7NVD Advisory· Published Sep 29, 2026
CVE-2026-84739
CVE-2026-84739
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
2- Range: from 13.11 before 19.2.7, 19.3 before 19.3.3, and 19.4 before 19.4.1
- Range: from 13.11 before 19.2.7, 19.3 before 19.3.3, and 19.4 before 19.4.1
Patches
Vulnerability mechanics
References
2News mentions
2- Critical GitLab Bugs Let Attackers Execute Code Through Malicious CI/CD RegexCyber Security News · Sep 25, 2026
- GitLab Critical Patch Release: 19.4.1, 19.3.3, 19.2.7GitLab Security Releases · Sep 23, 2026