CVE-2025-27933: Unauthorized Private-to-Public Channel Conversion
First published: Fri Mar 21 2025(Updated: )
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
Credit: responsibledisclosure@mattermost.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Mattermost | <=10.4.2<=10.3.3<=9.11.8 | |
| go/github.com/mattermost/mattermost/server/v8 | <8.0.0-20250218135018-e644e3c8e393 | 8.0.0-20250218135018-e644e3c8e393 |
| go/github.com/mattermost/mattermost-server | <9.11.9 | 9.11.9 |
| go/github.com/mattermost/mattermost/server/v8 | >=9.11.0<9.11.9 | 9.11.9 |
| go/github.com/mattermost/mattermost/server/v8 | >=10.3.0<10.3.4 | 10.3.4 |
| go/github.com/mattermost/mattermost/server/v8 | >=10.4.0<10.4.3 | 10.4.3 |
| Mattermost | >=9.11.0<9.11.9 | |
| Mattermost | >=10.3.0<10.3.4 | |
| Mattermost | >=10.4.0<10.4.3 |
Remedy
Update Mattermost to versions 10.5.0, 10.4.3, 10.3.4, 9.11.9 or higher.
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
Frequently Asked Questions
What is the severity of CVE-2025-27933?
CVE-2025-27933 has a medium severity level as it allows improper channel conversion leading to potential data exposure.
How do I fix CVE-2025-27933?
To resolve CVE-2025-27933, upgrade Mattermost to version 10.4.3 or higher, 10.3.4 or higher, or 9.11.9 or higher.
What versions are affected by CVE-2025-27933?
CVE-2025-27933 affects Mattermost versions 10.4.x up to 10.4.2, 10.3.x up to 10.3.3, and 9.11.x up to 9.11.8.
What is the exploit path for CVE-2025-27933?
CVE-2025-27933 can be exploited by users with permissions to convert public channels to private channels, allowing inappropriate conversions.
Is CVE-2025-27933 under active exploitation?
There is currently no public information suggesting that CVE-2025-27933 is under active exploitation.
- agent/title
- agent/weakness
- agent/remedy
- agent/type
- agent/first-publish-date
- agent/guess-ai
- agent/software-canonical-lookup
- agent/author
- collector/github-advisory-latest
- source/GitHub
- alias/GHSA-h5v9-xw2g-7hrq
- alias/CVE-2025-27933
- agent/references
- agent/source
- agent/description
- collector/mitre-cve
- source/MITRE
- agent/severity
- agent/last-modified-date
- collector/nvd-api
- source/NVD
- agent/tags
- agent/softwarecombine
- collector/nvd-cve
- agent/event
- collector/epss-latest
- source/FIRST
- agent/epss
- collector/github-advisory
- vendor/mattermost
- canonical/mattermost
- package-manager/go
- version/mattermost/9.11.0
- version/mattermost/10.3.0
- version/mattermost/10.4.0