Medium 5.9Published Oct 21, 2026

CVE-2026-16255Incorrect Authorization in GitLab

Updated under an hour ago (Oct 26, 2026, 1:10 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for GitLab

Exploited in the last 30 days

GitLab has remediated an issue in GitLab EE affecting all versions from 12.0 before 19.3.6, 19.4 before 19.4.3, and 19.5 before 19.5.1 that, when the instance-wide SAML or LDAP membership lock was enabled, an authenticated user could have granted or accepted project and group membership outside the identity provider's control, due to incomplete enforcement of the membership lock on requests created before the lock was enabled.

CVSS: 5.9 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N
Weakness (CWE): CWE-863
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitLab
NVD analysis: Awaiting Analysis
Record last updated: Oct 21, 2026
First seen by InfoSec Signals: Oct 21, 2026

Affected products

Affected products

GitLab GitLab gitlab:gitlab	from 12.0 before 19.3.6; from 19.4 before 19.4.3; from 19.5 before 19.5.1	CNA record

References

References

https://gitlab.com/gitlab-org/gitlab/-/work_items/606479
https://hackerone.com/reports/3809350	technical-description, exploit, permissions-required
https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-5-1-released/

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.