CVE-2023-5356

Name: CVE-2023-5356
Creator: NVD / NIST
Published: 2024-01-12T14:15:48.707+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.83%

Last modified Jun 17, 2026

CVE-2023-5356 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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.. EPSS estimates a 0.83% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

0.83%

52.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Gitlab	Gitlab	>= 8.13.0, < 16.5.6
Gitlab	Gitlab	>= 16.6.0, < 16.6.4
Gitlab	Gitlab	16.7.0
Gitlab	Gitlab	16.7.1

References

https://gitlab.com/gitlab-org/gitlab/-/issues/427154Broken Link
https://hackerone.com/reports/2188868Permissions Required
https://gitlab.com/gitlab-org/gitlab/-/issues/427154Broken Link
https://hackerone.com/reports/2188868Permissions Required

Timeline

Published: Jan 12, 2024
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-5356?

How severe is CVE-2023-5356?

CVE-2023-5356 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.83% probability of exploitation in the next 30 days.

How do I fix CVE-2023-5356?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-5356?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST