Home/CVE/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
CVE

CVE-2026-5173

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

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.

HIGH · CVSS 8.5 EPSS 0.00026
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-749Exposed Dangerous Method or Function
▤

Affected Products & Versions

3
gitlab>= 16.9.6 and < 18.8.9
gitlab>= 18.9.0 and < 18.9.5
gitlab>= 18.10.0 and < 18.10.3
▣

Scoring & Timeline

8.5
HIGH · CVSS v3.1 · cve@gitlab.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD08 Apr 2026 · 11:17 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

1
gitlab-securitypatch-release-gitlab-18-10-3-released
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://about.gitlab.com/releases/2026/04/08/patch-release-gitlab-18-10-3-released/Release NotesVendor Advisory
https://gitlab.com/gitlab-org/gitlab/-/work_items/588959Broken Link
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