CVE-2026-5173

Exposed Dangerous Method or Function in GitLab

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.9.6 before 18.8.9, 18.9 before 18.9.5, and 18.10 before 18.10.3 that could have allowed an authenticated user to invoke unintended server-side methods through websocket connections due to improper access control.

Affected

GitLab

CVSS v3.1 GITLAB

8.5 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

EPSS

0.36% chance of exploitation in the next 30 days, 29th percentile

Published

2026-04-08

Updated

2026-04-09

Proof-of-concept exploits (1)

• 0xBlackash/CVE-2026-51731★ · 2026-04-09

Security advisories

• https://about.gitlab.com/releases/2026/04/08/patch-release-gitlab-18-10-3-released

References

• CVE Record
• NVD entry