What is CVE-2025-8405?

CVE-2025-8405 is a high-severity vulnerability in Gitlab, classified under Improper Encoding or Escaping of Output. CVSS score: 7.7/10. Published 2025-12-11.

How severe is CVE-2025-8405?

High severity. CVSS v3 base score is 7.7 out of 10.

Vulnerability in Gitlab

CVE-2025-8405

GitLab has remediated a security issue in GitLab CE/EE affecting all versions from 17.1 before 18.4.6, 18.5 before 18.5.4, and 18.6 before 18.6.2 that could have allowed an authenticated user to perform unauthorized actions on behalf of ot…

EPSS: 0.005 (38.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N.

Affected products

Gitlab — versions 17.1, 18.5, 18.6

Weakness classification (CWE)

CWE-116 — Improper Encoding or Escaping of Output

References

cve@gitlab.com (issue-tracking, permissions-required, Broken Link)
cve@gitlab.com (Permissions Required, technical-description, permissions-required, exploit)
cve@gitlab.com (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2025-8405?: CVE-2025-8405 is a high-severity vulnerability in Gitlab, classified under Improper Encoding or Escaping of Output. CVSS score: 7.7/10. Published 2025-12-11.
How severe is CVE-2025-8405?: High severity. CVSS v3 base score is 7.7 out of 10.