Headline
GHSA-j5vq-62gr-8v3r: Mattermost fails to check Websocket request for proper UTF-8 format potentially crashing Calls plug-in
Mattermost versions 11.0.x <= 11.0.4, 10.12.x <= 10.12.2, 10.11.x <= 10.11.6 fail to check WebSocket request field for proper UTF-8 format, which allows attacker to crash Calls plug-in via sending malformed request.
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- GitHub Advisory Database
- GitHub Reviewed
- CVE-2025-12689
Mattermost fails to check Websocket request for proper UTF-8 format potentially crashing Calls plug-in
Moderate severity GitHub Reviewed Published Dec 17, 2025 to the GitHub Advisory Database • Updated Dec 20, 2025
Package
gomod github.com/mattermost/mattermost-plugin-calls (Go)
Affected versions
< 1.11.0
Description
Published to the GitHub Advisory Database
Dec 17, 2025
Last updated
Dec 20, 2025