Vulnerability · Published Nov 14, 2025 · Assigned by Mattermost
CVE-2025-55070Lack of MFA enforcement in WebSocket connections
Medium 6.5
In plain English
A medium-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 0.3% (higher than 25% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.3%top 75.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Mattermost versions <11 fail to enforce multi-factor authentication on WebSocket connections which allows unauthenticated users to access sensitive information via WebSocket events
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/mattermost/mattermost-server | 11.1.0 | GHSA-xpg8-8xpv-948p |
| Go | github.com/mattermost/mattermost-server | 11.1.0+incompatible | GO-2025-4128 |
| Go | github.com/mattermost/mattermost-server/v5 | no fix listed | GO-2025-4128 |
| Go | github.com/mattermost/mattermost-server/v6 | no fix listed | GO-2025-4128 |
| Go | github.com/mattermost/mattermost/server/v8 | 8.0.0-20250912063506-7d8b7b5e4a60 | GHSA-xpg8-8xpv-948p |
| Go | github.com/mattermost/mattermost/server/v8 | 8.0.0-20250912063506-7d8b7b5e4a60 | GO-2025-4128 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost | <11 – through <11 |
Weakness: CWE-306 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N