Vulnerability Details CVE-2025-10545
Mattermost versions 10.5.x <= 10.5.10, 10.11.x <= 10.11.2 fail to properly validate guest user permissions when adding channel members which allows guest users to add any team members to their private channels via the `/api/v4/channels/{channel_id}/members` endpoint
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 4.0%
CVSS Severity
CVSS v3 Score 3.1
References
Products affected by CVE-2025-10545
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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:10.5.0
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cpe:2.3:a:mattermost:mattermost_server:10.5.1
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cpe:2.3:a:mattermost:mattermost_server:10.5.10
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cpe:2.3:a:mattermost:mattermost_server:10.5.2
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cpe:2.3:a:mattermost:mattermost_server:10.5.3
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cpe:2.3:a:mattermost:mattermost_server:10.5.4
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cpe:2.3:a:mattermost:mattermost_server:10.5.5
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cpe:2.3:a:mattermost:mattermost_server:10.5.6
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cpe:2.3:a:mattermost:mattermost_server:10.5.7
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cpe:2.3:a:mattermost:mattermost_server:10.5.8
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cpe:2.3:a:mattermost:mattermost_server:10.5.9