CVE-2025-12734

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

3.5CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N

EPSS

0.3% chance of exploitation in the next 30 days; higher than 18% of CVEs (scores of 2026-10-25)

CWE

CWE-116

Published

2025-12-11

Modified

2026-10-14

Record from

the NVD, synced 2026-10-19

Affected

• gitlab:gitlab

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

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