SecuriTricks - CVE-2025-12653

Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.3 before 18.4.5, 18.5 before 18.5.3, and 18.6 before 18.6.1 that under specific conditions could have allowed an unauthenticated user to join arbitrary organizations by changing headers on some requests.

Product(s) Impacted

Vendor	Product	Versions
Gitlab	Gitlab Ce Gitlab Ee Gitlab	<18.4.5 <18.5.3 <18.6.1

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-290

Authentication Bypass by Spoofing

This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.

*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	<18.4.5	/	/	/	/	/	/	/
a	gitlab	gitlab_ee	<18.5.3	/	/	/	/	/	/	/
a	gitlab	gitlab	<18.6.1	/	/	/	/	/	/	/

References

https://gitlab.com/gitlab-org/gitlab/-/issues/579372

https://hackerone.com/reports/3370245

CVSS Score

6.5 / 10

CVSS Data - 3.1

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

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

View Vector String

Timeline

Published: Nov. 26, 2025, 8:15 p.m.
Last Modified: Nov. 26, 2025, 8:15 p.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-2025-12653