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CVE-2025-12421
Good to know:
Date: November 27, 2025
Mattermost versions 11.0.x <= 11.0.2, 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to to verify that the token used during the code exchange originates from the same authentication flow, which allows an authenticated user to perform account takeover via a specially crafted email address used when switching authentication methods and sending a request to the /users/login/sso/code-exchange endpoint. The vulnerability requires ExperimentalEnableAuthenticationTransfer to be enabled (default: enabled) and RequireEmailVerification to be disabled (default: disabled).
Severity Score
Related Resources (8)
Severity Score
Weakness Type (CWE)
Top Fix
Upgrade Version
Upgrade to version github.com/mattermost/mattermost - v10.5.13;github.com/mattermost/mattermost - v10.11.5;github.com/mattermost/mattermost - v10.12.2;github.com/mattermost/mattermost - v11.0.3;github.com/mattermost/mattermost/server/v8 - v8.0.0-20251022210333-acda1fb5dd46;github.com/mattermost/mattermost-server - v11.0.3;github.com/mattermost/mattermost-server - v10.12.2;github.com/mattermost/mattermost-server - v10.11.5;github.com/mattermost/mattermost-server - v10.5.13
CVSS v3.1
| Base Score: |
|
|---|---|
| Attack Vector (AV): | NETWORK |
| Attack Complexity (AC): | LOW |
| Privileges Required (PR): | LOW |
| User Interaction (UI): | NONE |
| Scope (S): | CHANGED |
| Confidentiality (C): | HIGH |
| Integrity (I): | HIGH |
| Availability (A): | HIGH |