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CVE-2023-6840

Missing Authorization in GitLab

MEDIUM
6.7
CVSS Score
Published: February 7, 2024 at 10:02 PM UTC
Updated: June 17, 2026 at 06:51 AM UTC
1 product affected across 1 vendorGitLab

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Severity
MEDIUM6.7
Exploit prediction
EPSS 0.6%
SSVC
PoC

Description

An issue has been discovered in GitLab EE affecting all versions from 16.4 prior to 16.6.7, 16.7 prior to 16.7.5, and 16.8 prior to 16.8.2 which allows a maintainer to change the name of a protected branch that bypasses the security policy added to block MR.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

GitLab· GitLabmaven
95%
16.4 ≤ v < 16.6.716.4.0 ≤ v < 16.6.716.7 ≤ v < 16.7.516.7.0 ≤ v < 16.7.516.8 ≤ v < 16.8.216.8.0 ≤ v < 16.8.216.416.716.8
Affected range stops below 16.6.7, so it looks safe — our inference, not a vendor statement
Affected range stops below 16.7.5, so it looks safe — our inference, not a vendor statement
Affected range stops below 16.8.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

Issue TrackingPermissions Required
Source: [email protected]
https://gitlab.com/gitlab-org/gitlab/-/issues/435500
Technical DescriptionExploitPermissions Required
Source: [email protected]
https://hackerone.com/reports/2280292

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.7MEDIUMGitLab
Attack Vector
NETWORK
Complexity
LOW
Privileges
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-862NVD-CWE-Other

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