Vulnerability · Published Dec 2, 2025 · Assigned by Mattermost
CVE-2025-13870Unauthorized access and subscription vulnerability in Boards
Low 3.1
In plain English
A low-severity missing authentication 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 15% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Mattermost versions 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to validate the user permission when accessing the files and subscribing to the block in Boards, which allows an authenticated user to access other board files and was able to subscribe to the block from other boards that the user does not have access to
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/mattermost/mattermost | 10.11.5 | GHSA-58w6-w55x-6wq8 |
| Go | github.com/mattermost/mattermost | 10.5.13 | GHSA-58w6-w55x-6wq8 |
| Go | github.com/mattermost/mattermost | 10.11.5+incompatible, 10.5.13+incompatible | GO-2025-4178 |
| Go | github.com/mattermost/mattermost-server | no fix listed | GO-2025-4178 |
| Go | github.com/mattermost/mattermost-server/v5 | no fix listed | GO-2025-4178 |
| Go | github.com/mattermost/mattermost-server/v6 | no fix listed | GO-2025-4178 |
| Go | github.com/mattermost/mattermost/server/v8 | 8.0.0-20251212204551-54f2e9b4afd5 | GO-2025-4178 |
| Go | github.com/mattermost/mattermost/server/v8 | 8.0.0-20250905150616-ba86dfc5876b | GHSA-58w6-w55x-6wq8 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost | 10.11.0 – through 10.11.410.5.0 – through 10.5.12 |
Weakness: CWE-306 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N