CVE-2025-6227: Mattermost has Insufficiently Protected Credentials

July 18, 2025 (updated July 21, 2025)

Mattermost versions 10.5.x <= 10.5.7, 9.11.x <= 9.11.16 fail to negotiate a new token when accepting the invite which allows a user that intercepts both invite and password to send synchronization payloads to the server that originally created the invite via the REST API.

References

github.com/advisories/GHSA-4fwj-8595-wp25
github.com/mattermost/mattermost
github.com/mattermost/mattermost/commit/fbf105f6ef8f6cd5a89f859f09a2d1216cd81c05
mattermost.com/security-updates
nvd.nist.gov/vuln/detail/CVE-2025-6227

Code Behaviors & Features

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