SecuriTricks - CVE-2025-12734

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 leak sensitive information from specifically crafted merge request titles.

Product(s) Impacted

Vendor	Product	Versions
Gitlab	Gitlab Ce	<15.6-18.4.6>, <18.5-18.5.4>, <18.6-18.6.2>

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-116

Improper Encoding or Escaping of Output

The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.

*CPE(s)

Affected systems and software identified for this CVE.

Type	Vendor	Product	Version	Update	Edition	Language	Software Edition	Target Software	Target Hardware	Other Information
a	gitlab	gitlab_ce	<15.6-18.4.6>	/	/	/	/	/	/	/
a	gitlab	gitlab_ce	<18.5-18.5.4>	/	/	/	/	/	/	/
a	gitlab	gitlab_ce	<18.6-18.6.2>	/	/	/	/	/	/	/

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

CVSS Score

3.5 / 10

CVSS Data - 3.1

Attack Vector: NETWORK
Attack Complexity: LOW
Privileges Required: LOW
Scope: UNCHANGED
Confidentiality Impact: NONE
Integrity Impact: LOW
Availability Impact: NONE

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

View Vector String

Timeline

Published: Dec. 11, 2025, 8:15 a.m.
Last Modified: Dec. 11, 2025, 8:15 a.m.

Status : Received

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

cve@gitlab.com

CVE-2025-12734