Cloudanix VulnDB

CVE-2025-12419

Critical · 9.9

CVSS

9.9

EPSS

0.3%

Published

Nov 27, 2025

CISA due date

—

The record

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.

Affected packages

Ecosystem Package Introduced Fixed
Go github.com/mattermost/mattermost-server 0 No fix
Go github.com/mattermost/mattermost-server 10.11.0 10.11.5
Go github.com/mattermost/mattermost-server 10.12.0 10.12.2
Go github.com/mattermost/mattermost-server 10.5.0 10.5.13
Go github.com/mattermost/mattermost-server 11.0.0 11.0.4
Go github.com/mattermost/mattermost-server/v5 0 No fix
Go github.com/mattermost/mattermost-server/v6 0 No fix
Go github.com/mattermost/mattermost/server/v8 0 8.0.0-20251028000919-d3ed703dc833
go github.com/mattermost/mattermost-server 10.11.0 10.11.5
go github.com/mattermost/mattermost-server 10.12.0 10.12.2
go github.com/mattermost/mattermost-server 10.5.0 10.5.13
go github.com/mattermost/mattermost-server 11.0.0 11.0.4
openSUSE:Leap 15.6 govulncheck-vulndb 0 0.0.20251230T014957-150000.1.134.1

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