CVE-2025-2571: Google OAuth Authentication Bypass for Converted Bot Accounts

Severity: medium (CVSS 4.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-05-30 · updated 2026-06-17
Weakness: CWE-303

Description

Mattermost versions 10.7.x <= 10.7.0, 10.6.x <= 10.6.2, 10.5.x <= 10.5.3, 9.11.x <= 9.11.12 fail to clear Google OAuth credentials when converting user accounts to bot accounts, allowing attackers to gain unauthorized access to bot accounts via the Google OAuth signup flow.

Affected products

Mattermost: from 9.11.0 before 9.11.13; from 10.5.0 before 10.5.4; from 10.6.0 before 10.6.3; from 10.7.0 before 10.7.1 — fixed in 10.5.4, 10.6.3, 10.7.1, 9.11.13

How to fix

Upgrade to a fixed version: Mattermost 10.5.4, 10.6.3, 10.7.1, 9.11.13. Check the vendor advisory for mitigations.

References

https://mattermost.com/security-updates

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