GitLab Community Edition/Enterprise Edition up to 18.4.4/18.5.2/18.6.0 authentication spoofing

CVSS Meta Temp Score
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CTI Interest Score
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6.8$0-$5k0.00

Summaryinfo

A vulnerability was found in GitLab Community Edition and Enterprise Edition up to 18.4.4/18.5.2/18.6.0. It has been classified as critical. This issue affects some unknown processing. This manipulation causes authentication spoofing. This vulnerability is tracked as CVE-2025-12653. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical was found in GitLab Community Edition and Enterprise Edition up to 18.4.4/18.5.2/18.6.0. Affected by this vulnerability is an unknown code block. The manipulation with an unknown input leads to a authentication spoofing vulnerability. The CWE definition for the vulnerability is CWE-290. This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was disclosed by pwnie as 579372. It is possible to read the advisory at gitlab.com. This vulnerability is known as CVE-2025-12653 since 11/03/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 298822 (GitLab 18.3 < 18.4.5 / 18.5 < 18.5.3 / 18.6 < 18.6.1 (CVE-2025-12653)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 18.4.5, 18.5.3 or 18.6.1 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (298822) and EUVD (EUVD-2025-199760). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.9
VulDB Meta Temp Score: 6.8

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 6.5
CNA Vector (GitLab): 🔒

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Authentication spoofing
CWE: CWE-290 / CWE-287
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 298822
Nessus Name: GitLab 18.3 < 18.4.5 / 18.5 < 18.5.3 / 18.6 < 18.6.1 (CVE-2025-12653)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Community Edition/Enterprise Edition 18.4.5/18.5.3/18.6.1

Timelineinfo

11/03/2025 CVE reserved
11/27/2025 +24 days Advisory disclosed
11/27/2025 +0 days VulDB entry created
02/15/2026 +80 days VulDB entry last update

Sourcesinfo

Vendor: gitlab.com

Advisory: 579372
Researcher: pwnie
Status: Confirmed

CVE: CVE-2025-12653 (🔒)
GCVE (CVE): GCVE-0-2025-12653
GCVE (VulDB): GCVE-100-333667
EUVD: 🔒

Entryinfo

Created: 11/27/2025 03:23
Updated: 02/15/2026 23:58
Changes: 11/27/2025 03:23 (66), 11/29/2025 02:19 (1), 02/15/2026 23:58 (2)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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