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CVE-2025-55073
Good to know:
Date: November 14, 2025
Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11, 10.12.x <= 10.12.0 fail to validate the relationship between the post being updated and the MSTeams plugin OAuth flow which allows an attacker to edit arbitrary posts via a crafted MSTeams plugin OAuth redirect URL.
Severity Score
Related Resources (10)
Severity Score
Weakness Type (CWE)
Missing Authentication for Critical Function
CWE-306Top Fix
Upgrade Version
Upgrade to version github.com/mattermost/mattermost-plugin-msteams - v2.2.2;github.com/mattermost/mattermost-server - v10.11.4;github.com/mattermost/mattermost-server - v10.5.12;github.com/mattermost/mattermost-server - v10.12.1;github.com/mattermost/mattermost-server - v10.5.12+incompatible;github.com/mattermost/mattermost/server/v8 - v8.0.0-20250929212932-a41db04d2746;https://github.com/mattermost/mattermost-plugin-msteams.git - v2.2.2
CVSS v3.1
| Base Score: |
|
|---|---|
| Attack Vector (AV): | NETWORK |
| Attack Complexity (AC): | LOW |
| Privileges Required (PR): | LOW |
| User Interaction (UI): | NONE |
| Scope (S): | UNCHANGED |
| Confidentiality (C): | NONE |
| Integrity (I): | LOW |
| Availability (A): | LOW |