Exposed Dangerous Method or Function in GitLab

published 2026-04-08 7 mo ago modified 2026-09-08 2 mo ago also BIT-gitlab-2026-5173 , EUVD-2026-20802

cvss: 8.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 37%
public exploits: 0; none known

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.

Patch / fix

fixed in 2

bitnami gitlab 18.8.9, 18.9.5, 18.10.3
GitLab GitLab 18.8.9, 18.9.5, 18.10.3

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 7 mo ago (2026-04-09)

Exploit prediction

0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	8.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
OSV	3.1	8.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
bitnami	gitlab	>=16.9.6, <18.8.9 >=18.9.0, <18.9.5 >=18.10.0, <18.10.3	18.8.9 18.9.5 18.10.3

Affected products

GitLab GitLab

Classification

Weakness

CWE-749 Exposed Dangerous Method or Function

Technology feeds

GitLab rss critical rss

References

about.gitlab.com /releases/2026/04/08/patch-release-gitlab-18-10-3-released/
release-notes, vendor-advisory, advisory
gitlab.com /gitlab-org/gitlab/-/work_items/588959
broken-link, web
nvd.nist.gov /vuln/detail/CVE-2026-5173
web

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.

Summary