CVE-2026-5173

HIGH

Exposed Dangerous Method or Function in GitLab

Title source: cna

Description

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.

Exploits (1)

nomisec WORKING POC

by 0xBlackash · poc

https://github.com/0xBlackash/CVE-2026-5173

View Code ZIP pw:eip

References (2)

https://gitlab.com/gitlab-org/gitlab/-/work_items/588959

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

Scores

CVSS v3 8.5

EPSS 0.0002

EPSS Percentile 6.2%

Attack Vector NETWORK

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

Details

CWE

CWE-749

Status published

Products (4)

GitLab/GitLab 16.9.6 - 18.8.9

gitlab/gitlab 16.9.6 - 18.8.9 (2 CPE variants)

GitLab/GitLab 18.10 - 18.10.3

GitLab/GitLab 18.9 - 18.9.5

Published Apr 08, 2026

Tracked Since Apr 09, 2026