VDB-343722 · CVE-2026-1751 · Issue 519340

GitLab Community Edition/Enterprise Edition up to 18.4.x Merge Request authorization

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3.0	$0-$5k	0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in GitLab Community Edition and Enterprise Edition up to 18.4.x. Impacted is an unknown function of the component Merge Request Handler. The manipulation results in authorization. This vulnerability is reported as CVE-2026-1751. The attack can be launched remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in GitLab Community Edition and Enterprise Edition up to 18.4.x. Affected is an unknown functionality of the component Merge Request Handler. The manipulation with an unknown input leads to a authorization vulnerability. CWE is classifying the issue as CWE-862. The product does not perform an authorization check when an actor attempts to access a resource or perform an action. This is going to have an impact on integrity. CVE summarizes:

A vulnerability has been discovered in GitLab CE/EE affecting all versions starting with 16.8 before 18.5.0 that could have allowed unauthorized edits to merge request approval rules under certain conditions.

The weakness was disclosed by theluci as 519340. The advisory is available at gitlab.com. This vulnerability is traded as CVE-2026-1751 since 02/02/2026. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available.

The vulnerability scanner Nessus provides a plugin with the ID 297655 (Linux Distros Unpatched Vulnerability : CVE-2026-1751), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 18.5.0 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (297655) and CERT Bund (WID-SEC-2026-0286). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

Open Source GitLab

Productinfo

Type

Bug Tracking Software

Vendor

GitLab

Name

Version

License

open-source

Website

Vendor: https://gitlab.com/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.1
VulDB Meta Temp Score: 3.0

VulDB Base Score: 3.1
VulDB Temp Score: 3.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 3.1
CNA Vector (GitLab): 🔒

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Authorization
CWE: CWE-862 / CWE-863 / CWE-285
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 297655
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-1751

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Community Edition/Enterprise Edition 18.5.0

Timelineinfo

02/02/2026 Advisory disclosed
02/02/2026 +0 days CVE reserved
02/02/2026 +0 days VulDB entry created
02/04/2026 +2 days VulDB entry last update

Sourcesinfo

Vendor: gitlab.com

Advisory: 519340
Researcher: theluci
Status: Confirmed

CVE: CVE-2026-1751 (🔒)
GCVE (CVE): GCVE-0-2026-1751
GCVE (VulDB): GCVE-100-343722
CERT Bund: WID-SEC-2026-0286 - GitLab: Schwachstelle ermöglicht Manipulation von Dateien

Entryinfo

Created: 02/02/2026 13:37
Updated: 02/04/2026 16:34
Changes: 02/02/2026 13:37 (66), 02/03/2026 11:47 (7), 02/04/2026 02:38 (2), 02/04/2026 16:34 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.