CVE-2025-12653 | BDVDB-2026-303154 Detail

GitLabGitLab

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.

Impact#

Per CVSS v3.1: confidentiality impact low, integrity impact low, availability impact none. Attack vector: network.

Weaknesses#

CWE-290 Authentication Bypass by Spoofing

References#

Exploit#

https://hackerone.com/reports/3370245

History#

Version 12025-11-26Record published in the CVE List.
Version 22025-12-10Most recent update recorded in the CVE List.

Published

Published: 2025-11-26
Last modified: 2025-12-10

Vendor information

Vendor: GitLab
Product: GitLab

All GitLab vulnerabilities

Score

6.5 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 24.0.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Not classified

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= 18.3 and < 18.4.5
Fixed
18.4.5
Vulnerable
>= 18.5 and < 18.5.3
Fixed
18.5.3
Vulnerable
>= 18.6 and < 18.6.1
Fixed
18.6.1

Scoring System

CVSS v4.0

Not available

CVSS v3.1

6.5 Medium

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

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Privileges Required	None
User Interaction	None
Scope	Unchanged
Confidentiality	Low
Integrity	Low
Availability	None

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).