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CVE-2025-12419

CRITICAL
9.9
CVSS 3.1
Description
Mattermost versions 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12, 11.0.x <= 11.0.3 fail to properly validate OAuth state tokens during OpenID Connect authentication which allows an authenticated attacker with team creation privileges to take over a user account via manipulation of authentication data during the OAuth completion flow. This requires email verification to be disabled (default: disabled), OAuth/OpenID Connect to be enabled, and the attacker to control two users in the SSO system with one of them never having logged into Mattermost.

Metadata

CVE ID
CVE-2025-12419
State
PUBLISHED
Assigner
Mattermost
Reserved
2025-10-28 16:09 UTC
Published
2025-11-27 15:55 UTC
Last updated
2026-02-26 16:07 UTC
Primary CWE
CWE-303
CWE-303: Incorrect Implementation of Authentication Algorith…
Vendor / Product
Mattermost / Mattermost
Sources
cve.org  ·  NVD

Severity & Metrics

9.9 CRITICAL CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
SSVC — CISA Coordinator
Exploitation
none
Automatable
no
Tech. Impact
total
Affected products (1)
VendorProductPlatformVersions
Mattermost Mattermost — 10.12.0 ≤ 10.12.1, 10.11.0 ≤ 10.11.4, 10.5.0 ≤ 10.5.12, 11.0.0 ≤ 11.0.3 …
Weakness (CWE)
CWESourceDescription
CWE-303 cna CWE-303: Incorrect Implementation of Authentication Algorithm
CVSS scores (1)
ScoreSeverityVersionSourceVector
9.9 CRITICAL 3.1 cna CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
References (1)
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