CVE-2026-5816

HIGH 8.0

Improper Resolution of Path Equivalence in GitLab

CVSS Score

8.0

EPSS Score

0.0%

EPSS Percentile

0th

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.10 before 18.10.4 and 18.11 before 18.11.1 that could have allowed an unauthenticated user to execute arbitrary JavaScript in a user's browser session due to improper path validation under certain conditions.

CWE	CWE-41
Vendor	gitlab
Product	gitlab
Ecosystems	DevTools
Industries	Technology
Published	Apr 22, 2026
Last Updated	Apr 22, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

None

Affected Versions

GitLab / GitLab

18.10 < 18.10.4 18.11 < 18.11.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

hackerone.com: https://hackerone.com/reports/3572231 gitlab.com: https://gitlab.com/gitlab-org/gitlab/-/work_items/592816 about.gitlab.com: https://about.gitlab.com/releases/2026/04/22/patch-release-gitlab-18-11-1-released/

Credits

Thanks [joaxcar](https://hackerone.com/joaxcar) for reporting this vulnerability through our HackerOne bug bounty program