Vulnerability · Published Apr 22, 2026 · Assigned by GitLab
CVE-2026-5816Improper Resolution of Path Equivalence in GitLab
High 8.0
In plain English
A high-severity security flaw in GitLab from GitLab. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities).
Severity (CVSS 3.1)8.0High
Exploit odds (30 days)0.4%top 64.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
Weakness: CWE-41 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
References
- HackerOne Bug Bounty Report #3572231 technical-description, exploit, permissions-required
- https://gitlab.com/gitlab-org/gitlab/-/work_items/592816
- https://about.gitlab.com/releases/2026/04/22/patch-release-gitlab-18-11-1-released/