CVE-2025-1412: Session Persistence After User-to-Bot Conversion

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-02-24 · updated 2026-06-17
Weakness: CWE-384

Description

Mattermost versions 9.11.x <= 9.11.6, 10.4.x <= 10.4.1 fail to invalidate all active sessions when converting a user to a bot, with allows the converted user to escalate their privileges depending on the permissions granted to the bot.

Affected products

Mattermost: from 9.11.0 before 9.11.7; from 10.4.0 before 10.4.2 — fixed in 10.4.2, 9.11.7

How to fix

Upgrade to a fixed version: Mattermost 10.4.2, 9.11.7. Check the vendor advisory for mitigations.

References

https://mattermost.com/security-updates

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