CVEvulnerability

CVE-2025-12421

9.9 CRITICAL Published 2025-11-27 Modified 2026-10-19 Official page ↗
Status
Analyzed
Published
2025-11-27
Last modified
2026-10-19
Assigner
[email protected]
CVSS 3.1 ([email protected])
9.9 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weaknesses
CWE-303

Description

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).

Affected configurations

• mattermost mattermost server (>= 10.5.0 < 10.5.13) • mattermost mattermost server (>= 10.11.0 < 10.11.5) • mattermost mattermost server (>= 10.12.0 < 10.12.2) • mattermost mattermost server (>= 11.0.0 < 11.0.3)

Related

Weakness · CWE (1)

  • CWE-303 Incorrect Implementation of Authentication Algorithm weakness

References