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CVE-2023-3964

Incorrect Authorization in GitLab

MEDIUM
4.3
CVSS Score
Published: December 1, 2023 at 07:02 AM UTC
Updated: June 17, 2026 at 06:15 AM UTC
1 product affected across 1 vendorGitLab

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Severity
MEDIUM4.3
Exploit prediction
EPSS 0.5%
SSVC
PoC

Description

An issue has been discovered in GitLab affecting all versions starting from 13.2 before 16.4.3, all versions starting from 16.5 before 16.5.3, all versions starting from 16.6 before 16.6.1. It was possible for users to access composer packages on public projects that have package registry disabled in the project settings.

Affected

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

GitLab· GitLabmaven
95%
13.2 ≤ v < 16.4.313.2.0 ≤ v < 16.4.316.5 ≤ v < 16.5.316.5.0 ≤ v < 16.5.316.6 ≤ v < 16.6.113.216.516.616.6.0
Affected range stops below 16.4.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 16.5.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 16.6.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Issue TrackingPermissions RequiredBroken LinkVendor Advisory
Source: [email protected]
https://gitlab.com/gitlab-org/gitlab/-/issues/419857
Technical DescriptionExploitPermissions RequiredThird Party Advisory
Source: [email protected]
https://hackerone.com/reports/2037316

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

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

CVSS

4.3MEDIUMGitLab
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-863NVD-CWE-noinfo

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