Skip to content

Mattermost allows members with permission to convert public channels to private and convert private to public

Moderate severity GitHub Reviewed Published Mar 21, 2025 to the GitHub Advisory Database • Updated Mar 21, 2025

Package

gomod github.com/mattermost/mattermost-server (Go)

Affected versions

< 9.11.9

Patched versions

9.11.9
gomod github.com/mattermost/mattermost/server/v8 (Go)
>= 10.4.0, < 10.4.3
>= 10.3.0, < 10.3.4
>= 9.11.0, < 9.11.9
< 8.0.0-20250218135018-e644e3c8e393
10.4.3
10.3.4
9.11.9
8.0.0-20250218135018-e644e3c8e393

Description

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

References

Published by the National Vulnerability Database Mar 21, 2025
Published to the GitHub Advisory Database Mar 21, 2025
Reviewed Mar 21, 2025
Last updated Mar 21, 2025

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(3rd percentile)

Weaknesses

CVE ID

CVE-2025-27933

GHSA ID

GHSA-h5v9-xw2g-7hrq

Source code

Loading Checking history
See something to contribute? Suggest improvements for this vulnerability.