# CVE-2026-5816

## Summary

- **CVE ID:** CVE-2026-5816
- **Severity:** HIGH
- **CVSS Score:** 8 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N)
- **CWE:** CWE-41
- **Published:** Apr 22, 2026
- **Last Modified:** Apr 23, 2026

## 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

- GitLab — GitLab (18.10)
- GitLab — GitLab (18.11)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.41%
- **EPSS Percentile:** 34.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-09._