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CVE-2025-10545
Good to know:
Date: October 16, 2025
Mattermost versions 10.5.x <= 10.5.10, 10.11.x <= 10.11.2 fail to properly validate guest user permissions when adding channel members which allows guest users to add any team members to their private channels via the "/api/v4/channels/{channel_id}/members" endpoint
Severity Score
Related Resources (8)
Severity Score
Weakness Type (CWE)
Incorrect Authorization
CWE-863Top Fix
Upgrade Version
Upgrade to version github.com/mattermost/mattermost - v10.5.11;github.com/mattermost/mattermost - v10.11.3;github.com/mattermost/mattermost/server/v8 - v8.0.0-20250820115038-ff30b84049f0;github.com/mattermost/mattermost-server - v10.5.11;github.com/mattermost/mattermost-server - v10.11.3
CVSS v3.1
| Base Score: |
|
|---|---|
| Attack Vector (AV): | NETWORK |
| Attack Complexity (AC): | HIGH |
| Privileges Required (PR): | LOW |
| User Interaction (UI): | NONE |
| Scope (S): | UNCHANGED |
| Confidentiality (C): | LOW |
| Integrity (I): | NONE |
| Availability (A): | NONE |