CVE-2025-8405

Improper Encoding or Escaping of Output in GitLab

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 other users by injecting malicious HTML into vulnerability code flow displays.

Affected

GitLab

CVSS v3.1 GITLAB

7.7 HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N

EPSS

0.52% chance of exploitation in the next 30 days, 43rd percentile

Published

2025-12-11

Updated

2026-02-26

Proof-of-concept exploits (1)

• https://hackerone.com/reports/3270940

Security advisories

• https://about.gitlab.com/releases/2025/12/10/patch-release-gitlab-18-6-2-released

References

• CVE Record
• NVD entry