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CVE-2026-16255

7.1, high

GitLab Incorrect Authorization Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
7.1, high high CVSS v3.1
EPSS, next 30 days
0.2% higher than 11% of scored CVEs
Exploitation
No public evidence
Published
22 Oct 20268 days ago

Description

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.

Details

Vendor
GitLab
Product
GitLab
Weakness
CWE-863 (opens in a new tab)
Status
Analyzed
Updated
29 Oct 2026
Assigner
cve@gitlab.com

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

References 3

Patches and fixes 1

Other references 2

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other GitLab CVEs

Every GitLab CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-97229 GitLab Community Edition and Enterprise Edition Integer Overflow or Wraparound Vulnerability KEV EPSS 18% 10, critical
  • CVE-2026-85706 GitLab Community Edition and Enterprise Edition Path Traversal Vulnerability KEV EPSS 97% 10, critical
  • CVE-2023-7028 GitLab Community and Enterprise Editions Improper Access Control Vulnerability KEV EPSS 94% 9.8, critical
  • CVE-2021-39935 GitLab Community and Enterprise Editions Server-Side Request Forgery (SSRF) Vulnerability KEV EPSS 36% 7.5, high
  • CVE-2021-22175 GitLab Server-Side Request Forgery (SSRF) Vulnerability KEV EPSS 53% 9.8, critical
  • CVE-2021-22205 GitLab Community and Enterprise Editions Remote Code Execution Vulnerability KEV EPSS 100% 10, critical
  • CVE-2026-75871 GitLab AI Gateway Server-Side Request Forgery Vulnerability EPSS 0.3% 9.6, critical
  • CVE-2026-18252 GitLab has remediated an issue in GitLab EE affecting all versions from 18.9 before 19.1.7, 19.2 before 19.2.5, and 19.3 before 19.3.1… EPSS 0.5% 8.1, high

Beyond this page

Is CVE-2026-16255 in your network?

This page tells you how dangerous CVE-2026-16255 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 30 Oct 2026, not the live upstream state.