Vulnerability · Published Nov 14, 2025 · Assigned by Mattermost
CVE-2025-41436Unauthorized access to archived channel content via threads interface
Low 3.1
In plain English
A low-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 8% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)3.1Low
Exploit odds (30 days)0.2%top 92.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Mattermost versions <11.0 fail to properly enforce the "Allow users to view archived channels" setting which allows regular users to access archived channel content and files via the "Open in Channel" functionality from followed threads
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/mattermost/mattermost-server | 11.0.0-alpha.1 | GHSA-x3hx-ch7p-8xgg |
| Go | github.com/mattermost/mattermost-server | 11.0.0-alpha.1+incompatible | GO-2025-4131 |
| Go | github.com/mattermost/mattermost-server/v5 | no fix listed | GO-2025-4131 |
| Go | github.com/mattermost/mattermost-server/v6 | no fix listed | GO-2025-4131 |
| Go | github.com/mattermost/mattermost/server/v8 | 8.0.0-20250815165020-c8d66301415d | GHSA-x3hx-ch7p-8xgg |
| Go | github.com/mattermost/mattermost/server/v8 | 8.0.0-20250815165020-c8d66301415d | GO-2025-4131 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost | <11.0 – through <11.0 |
Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N