What is GHSA-j5vq-62gr-8v3r?

GHSA-j5vq-62gr-8v3r is a security advisory published by GitHub Security Advisories with Medium severity. Mattermost fails to check Websocket request for proper UTF-8 format potentially crashing Calls plug-in

Which CVE IDs does GHSA-j5vq-62gr-8v3r cover?

GHSA-j5vq-62gr-8v3r covers the following CVE IDs: CVE-2025-12689. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-j5vq-62gr-8v3r?

GHSA-j5vq-62gr-8v3r has a CVSS v3 base score of 6.5, published by GitHub Security Advisories.

Which products are affected by GHSA-j5vq-62gr-8v3r?

GHSA-j5vq-62gr-8v3r affects 1 product, including: go/github.com/mattermost/mattermost-plugin-calls:\u003c 1.11.0.

GHSA-j5vq-62gr-8v3rMediumCVSS 6.5

Mattermost fails to check Websocket request for proper UTF-8 format potentially crashing Calls plug-in

Vendor

GitHub Security Advisories

Published

December 17, 2025

Last Modified

December 20, 2025

🔗 CVE IDs covered (1)

CVE-2025-12689 →

📋 Description

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.

🎯 Affected products1

go/github.com/mattermost/mattermost-plugin-calls:< 1.11.0

🔗 References (4)

https://nvd.nist.gov/vuln/detail/CVE-2025-12689
https://mattermost.com/security-updates
https://github.com/mattermost/mattermost-plugin-calls/commit/f68b41980e1274e05cf91c687e2af1a73c5e36ca
https://github.com/advisories/GHSA-j5vq-62gr-8v3r