Vulnerability Details CVE-2025-12689
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 20.6%
CVSS Severity
CVSS v3 Score 6.5
References
Products affected by CVE-2025-12689
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cpe:2.3:a:mattermost:mattermost_server:10.11.0
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cpe:2.3:a:mattermost:mattermost_server:10.11.1
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cpe:2.3:a:mattermost:mattermost_server:10.11.2
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cpe:2.3:a:mattermost:mattermost_server:10.11.3
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cpe:2.3:a:mattermost:mattermost_server:10.11.4
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cpe:2.3:a:mattermost:mattermost_server:10.11.5
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cpe:2.3:a:mattermost:mattermost_server:10.11.6
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cpe:2.3:a:mattermost:mattermost_server:10.12.0
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cpe:2.3:a:mattermost:mattermost_server:10.12.1
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cpe:2.3:a:mattermost:mattermost_server:10.12.2
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cpe:2.3:a:mattermost:mattermost_server:11.0.0
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cpe:2.3:a:mattermost:mattermost_server:11.0.1
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cpe:2.3:a:mattermost:mattermost_server:11.0.2
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cpe:2.3:a:mattermost:mattermost_server:11.0.3
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cpe:2.3:a:mattermost:mattermost_server:11.0.4