Missing Authorization in GitLab

published 2026-02-02 9 mo ago modified 2026-09-08 2 mo ago also BIT-gitlab-2026-1751 , EUVD-2026-5136

cvss: 3.1; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 15%
public exploits: 0; none known

A vulnerability has been discovered in GitLab CE/EE affecting all versions starting with 16.8 before 18.5.0 that could have allowed unauthorized edits to merge request approval rules under certain conditions.

Patch / fix

fixed in 2

bitnami gitlab 18.5.0
GitLab GitLab 18.5.0

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 9 mo ago (2026-02-02)

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

hackerone.com https://hackerone.com/reports/2980839 referenced PoC, tagged "exploit" by a source, unverified
gitlab.com https://gitlab.com/gitlab-org/gitlab/-/issues/519340 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

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

Affected packages

ecosystem	package	affected	fixed in
bitnami	gitlab	>=16.8.0, <18.5.0	18.5.0

Affected products

GitLab GitLab

Classification

Weakness

CWE-862 Missing Authorization

Technology feeds

GitLab rss critical rss

References

hackerone.com /reports/2980839
technical-description, exploit, permissions-required, web
gitlab.com /gitlab-org/gitlab/-/issues/519340
issue-tracking, permissions-required, exploit, vendor-advisory, advisory
nvd.nist.gov /vuln/detail/CVE-2026-1751
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.

Summary