CVE-2025-12689 — Improper Validation of Specified Type of Input in Mattermost Mattermost-plugin-calls

CWE-1287 — Improper Validation of Specified Type of Input6 documents5 sources

Severity

6.5MEDIUMNVD

EPSS

0.1%

top 73.59%

CISA KEV

Not in KEV

Exploit

No known exploits

Affected products

Github.com Mattermost Mattermost-plugin-calls Mattermost Server Mattermost

Timeline

PublishedDec 17

Latest updateDec 30

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HExploitability: 2.8 | Impact: 3.6

Affected Packages3 packages

▶Gogithub.com/mattermost_mattermost-plugin-calls< 1.11.0

▶NVDmattermost/mattermost_server10.11.0 — 10.11.7+2

▶CVEListV5mattermost/mattermost11.0.0 — 11.0.4+2

🔴Vulnerability Details

OSV

Mattermost fails to check Websocket request for proper UTF-8 format potentially crashing Calls plug-in in github.com/mattermost/mattermost-plugin-calls↗2025-12-30

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OSV

Mattermost fails to check Websocket request for proper UTF-8 format potentially crashing Calls plug-in↗2025-12-17

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CVEList

DoS in Calls plugin via malformed UTF-8 in WebSocket request↗2025-12-17

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GHSA

Mattermost fails to check Websocket request for proper UTF-8 format potentially crashing Calls plug-in↗2025-12-17

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🕵️Threat Intelligence

Wiz

CVE-2025-12689 Impact, Exploitability, and Mitigation Steps | Wiz↗

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