CVE-2025-8405

Improper Encoding or Escaping of Output in GitLab

CVSS 7.7 HIGHEPSS 0.5%CWE-116

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 7.7EPSS 0.5%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

11 Dec 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

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

Affected products

GitLab · GitLab

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References

https://about.gitlab.com/releases/2025/12/10/patch-release-gitlab-18-6-2-released/https://gitlab.com/gitlab-org/gitlab/-/issues/558214 https://hackerone.com/reports/3270940