GO-2025-4255 — Vulnetix

GO-2025-4255 PUBLISHED CVSS 8.699999809265137 HIGH

Mattermost fails to check Websocket request for proper UTF-8 format potentially crashing Calls plug-in in github.com/mattermost/mattermost-plugin-calls

Risk Scores

CVSS v4.0

8.699999809265137

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Affected Products

Vendor	Product	Versions
github.com	mattermost/mattermost-plugin-calls	0, 0

Timeline

Dec 30, 2025 CVE Published
Mar 3, 2026 CVE Updated
May 1, 2026 Security Advisory

References

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

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