Low severity · published Dec 11, 2025
CVE-2025-12734
Improper Encoding or Escaping of Output in GitLab
3.5
CVSS
0.3%
EPSS
No
On KEV
Description
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 vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 19% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GI
GitLab · GitLab
15.6 before 18.4.6; 18.5 before 18.5.4; 18.6 before 18.6.2 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-12734
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-12734
Release Notes
https://about.gitlab.com/releases/2025/12/10/patch-release-gitlab-18-6-2-released/
Broken Link
https://gitlab.com/gitlab-org/gitlab/-/issues/579573
Permissions Required
https://hackerone.com/reports/3379381
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