CVE-2026-5173

EUVD-2026-20802
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
8.5 HIGH
NETWORK
LOW
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 7%
Affected Products (NVD)
VendorProductVersion
gitlabgitlab
16.9.6 ≤
𝑥
< 18.8.9
gitlabgitlab
18.9.0 ≤
𝑥
< 18.9.5
gitlabgitlab
18.10.0 ≤
𝑥
< 18.10.3
gitlabgitlab
16.9.6 ≤
𝑥
< 18.8.9
gitlabgitlab
18.9.0 ≤
𝑥
< 18.9.5
gitlabgitlab
18.10.0 ≤
𝑥
< 18.10.3
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://about.gitlab.com/releases/2026/04/08/patch-release-gitlab-18-10-3-released/
https://gitlab.com/gitlab-org/gitlab/-/work_items/588959