High severity · published Apr 8, 2026
CVE-2026-5173
Exposed Dangerous Method or Function in GitLab
8.5
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 37% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GI
GitLab · GitLab
16.9.6 before 18.8.9; 18.9 before 18.9.5; 18.10 before 18.10.3 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-5173
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-5173
Release Notes
https://about.gitlab.com/releases/2026/04/08/patch-release-gitlab-18-10-3-released/
Broken Link
https://gitlab.com/gitlab-org/gitlab/-/work_items/588959
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