CVE-2025-27933

Name: CVE-2025-27933
Creator: NVD / NIST
Published: 2025-03-21T09:15:13.26+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.19%

Last modified Jun 17, 2026

CVE-2025-27933 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. Mattermost versions 10.4.x <= 10.4.2, 10.3.x <= 10.3.3, 9.11.x <= 9.11.8 fail to fail to enforce channel conversion restrictions, which allows members with permission to convert public channels to private ones to also convert private ones to public. EPSS estimates a 0.19% chance of exploitation in the next 30 days.

Description

Mattermost versions 10.4.x <= 10.4.2, 10.3.x <= 10.3.3, 9.11.x <= 9.11.8 fail to fail to enforce channel conversion restrictions, which allows members with permission to convert public channels to private ones to also convert private ones to public

Metrics

CVSS 3.1

4.3/10

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

EPSS Probability

0.19%

9.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Mattermost	Mattermost Server	>= 9.11.0, < 9.11.9
Mattermost	Mattermost Server	>= 10.3.0, < 10.3.4
Mattermost	Mattermost Server	>= 10.4.0, < 10.4.3

References

https://mattermost.com/security-updatesVendor Advisory

Timeline

Published: Mar 21, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-27933?

How severe is CVE-2025-27933?

CVE-2025-27933 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.19% probability of exploitation in the next 30 days.

How do I fix CVE-2025-27933?

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-2025-27933?

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

Scan your code now

Source: NVD / NIST