CVE-2023-5356

HIGH 7.3

Incorrect Authorization in GitLab

CVSS Score

7.3

EPSS Score

0.1%

EPSS Percentile

20th

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.

CWE	CWE-863
Vendor	gitlab
Product	gitlab
Ecosystems	DevTools
Industries	Technology
Published	Jan 12, 2024
Last Updated	Apr 28, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

High

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

None

Affected Versions

GitLab / GitLab

8.13 < 16.5.6 16.6 < 16.6.4 16.7 < 16.7.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

gitlab.com: https://gitlab.com/gitlab-org/gitlab/-/issues/427154 hackerone.com: https://hackerone.com/reports/2188868

Credits

Thanks [yvvdwf](https://hackerone.com/yvvdwf) for reporting this vulnerability through our HackerOne bug bounty program