CVE-2025-12734

Improper Encoding or Escaping of Output in GitLab

CVSS 3.5 LOWEPSS 0.2%CWE-116

Vexday Risk Score

8Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 3.5EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

11 Dec 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 15.6 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, under certain conditions, render content in dialogs to other users by injecting malicious HTML content into merge request titles.

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/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/579573 https://hackerone.com/reports/3379381