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CVE-2023-5356

Incorrect Authorization in GitLab

HIGH
8.8
CVSS Score
Published: January 12, 2024 at 01:56 PM UTC
Updated: June 17, 2026 at 06:48 AM UTC
1 product affected across 1 vendorGitLab

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Severity
HIGH8.8
Exploit prediction
EPSS 0.8%
SSVC
No known exploit

Description

Incorrect authorization checks in GitLab CE/EE from all versions starting from 8.13 before 16.5.6, all versions starting from 16.6 before 16.6.4, all versions starting from 16.7 before 16.7.2, allows a user to abuse slack/mattermost integrations to execute slash commands as another user.

Affected

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

GitLab· GitLabmaven
95%
16.6 ≤ v < 16.6.416.6.0 ≤ v < 16.6.416.7 ≤ v < 16.7.28.13 ≤ v < 16.5.68.13.0 ≤ v < 16.5.616.616.716.7.016.7.18.13
Affected range stops below 16.5.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 16.6.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 16.7.2, 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 RequiredBroken Link
Source: [email protected]
https://gitlab.com/gitlab-org/gitlab/-/issues/427154
Technical DescriptionExploitPermissions Required
Source: [email protected]
https://hackerone.com/reports/2188868

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

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

CVSS

8.8HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-863

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