CVE-2025-20630: Mattermost Mobile

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

Mattermost Mobile versions <=2.22.0 fail to properly handle posts with attachments containing fields that cannot be cast to a String, which allows an attacker to cause the mobile to crash via creating and sending such a post to a channel.

Affected products

• Mattermost Mattermost Mobile: before 2.23.0 (fixed in 2.23.0)

Published 2025-01-16. Last modified 2026-06-17.