GO-2025-4255

vendorUSosv

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

view advisory published 2025-12-30Licence: per source

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

describes (1)

Related CVEs.

ID	severity	EPSS	exploitable	published
CVE-2025-12689US	—	0.29% (21st)	—	2025-12-17
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 plu…

references

External citations — patches, advisories, analysis.

https://github.com/advisories/GHSA-j5vq-62gr-8v3rADVISORY
https://github.com/mattermost/mattermost-plugin-calls/commit/f68b41980e1274e05cf91c687e2af1a73c5e36caFIX
https://mattermost.com/security-updatesWEB
https://nvd.nist.gov/vuln/detail/CVE-2025-12689ADVISORY

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