Auth bypass in GitLab

CVE-2025-10871

An issue has been discovered in GitLab EE affecting all versions from 16.6 before 18.2.7, 18.3 before 18.3.3, and 18.4 before 18.4.1. Project Maintainers can exploit a vulnerability where they can assign custom roles to users with permissions exceeding their own, effectively granting themselves elevated privileges.

Vulnerability class: Broken Access Control

Published · last modified .

CVSS v3 metric

CVSS v3 base score 3.8 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L.

EPSS exploit prediction

EPSS: 0.004 (29.1th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 29.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2025-10871: held from 0.004 to 0.004.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

  • GitLab — versions 18.4.0, 18.3, 18.4

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2025-10871?
CVE-2025-10871 is a low-severity vulnerability in GitLab, classified under Missing Authorization. CVSS score: 3.8/10. Published 2025-09-26.
How severe is CVE-2025-10871?
Low severity. CVSS v3 base score is 3.8 out of 10.