CVE-2026-5816

Name: CVE-2026-5816
Creator: NVD / NIST
Published: 2026-04-22T17:16:44.763+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10EPSS 0.41%

Last modified Jun 17, 2026

CVE-2026-5816 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. 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.. EPSS estimates a 0.41% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.1/10

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

EPSS Probability

0.41%

32.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-41

Affected Software

Vendor	Product	Versions
Gitlab	Gitlab	>= 18.10.0, < 18.10.4
Gitlab	Gitlab	18.11.0

References

https://about.gitlab.com/releases/2026/04/22/patch-release-gitlab-18-11-1-released/Release Notes, Vendor Advisory
https://gitlab.com/gitlab-org/gitlab/-/work_items/592816Broken Link
https://hackerone.com/reports/3572231Permissions Required

Timeline

Published: Apr 22, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-5816?

How severe is CVE-2026-5816?

CVE-2026-5816 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 0.41% probability of exploitation in the next 30 days.

How do I fix CVE-2026-5816?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-5816?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST