GO-2025-4189 Mattermost Server is vulnerable to XSS through author_link field in Slack attachments in github.com/mattermost/mattermost-server

Mattermost Server is vulnerable to XSS through authorlink field in Slack attachments in github.com/mattermost/mattermost-server...

GHSA-498J-WXWW-J897 Mattermost Server is vulnerable to XSS through author_link field in Slack attachments

An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. XSS could occur via the authorlink field of a Slack attachment...