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OpenAdvisories
High · 8.5 Public exploit CVE-2026-5173 EUVD-2026-20802GHSA-5gj7-3j23-w2h2

Exposed Dangerous Method or Function in GitLab

Published Apr 8, 2026 · Updated Apr 9, 2026 · Assigned by GitLab

Vendor: GitLab Product: GitLab Package: gitlab Category: Web / CMS Ecosystem: Ubuntu

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.

Affected products

VendorProductAffectedFixed
GitLab GitLab 16.9.6 – < 18.8.9, 18.9 – < 18.9.5, 18.10 – < 18.10.3 18.8.9

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Ubuntu

Security tracker ↗
ReleasePackageFixed inAdvisory
Ubuntu 16.04 LTS gitlab No fix yet —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Advisories 1

References