CVE-2025-21088 Information

Description

Mattermost versions 10.2.x <= 10.2.0 9.11.x <= 9.11.5 10.0.x <= 10.0.3 10.1.x <= 10.1.3 fail to properly validate the style of proto supplied to an action’s style in post.props.attachments which allows an attacker to crash the frontend via crafted malicious input.

Reference

https://mattermost.com/security-updates