Vulnerability · Published Mar 21, 2025 · Assigned by Mattermost
CVE-2025-27933Unauthorized Private-to-Public Channel Conversion
Medium 5.4
In plain English
A medium-severity incorrect authorization in Mattermost from Mattermost. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 11% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.4Medium
Exploit odds (30 days)0.2%top 88.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/mattermost/mattermost-server | 10.3.4+incompatible, 10.4.3+incompatible, 9.11.9+incompatible | GO-2025-3556 |
| Go | github.com/mattermost/mattermost-server | 9.11.9 | GHSA-h5v9-xw2g-7hrq |
| Go | github.com/mattermost/mattermost-server/v5 | no fix listed | GO-2025-3556 |
| Go | github.com/mattermost/mattermost-server/v6 | no fix listed | GO-2025-3556 |
| Go | github.com/mattermost/mattermost/server/v8 | 10.4.3 | GHSA-h5v9-xw2g-7hrq |
| Go | github.com/mattermost/mattermost/server/v8 | 8.0.0-20250218135018-e644e3c8e393 | GO-2025-3556 |
| Go | github.com/mattermost/mattermost/server/v8 | 10.3.4 | GHSA-h5v9-xw2g-7hrq |
| Go | github.com/mattermost/mattermost/server/v8 | 9.11.9 | GHSA-h5v9-xw2g-7hrq |
| Go | github.com/mattermost/mattermost/server/v8 | 8.0.0-20250218135018-e644e3c8e393 | GHSA-h5v9-xw2g-7hrq |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost | 10.4.0 – through 10.4.210.3.0 – through 10.3.39.11.0 – through 9.11.8 |
Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N