Vulnerability Details CVE-2025-6226
Mattermost versions 10.5.x <= 10.5.6, 10.8.x <= 10.8.1, 10.7.x <= 10.7.3, 9.11.x <= 9.11.16 fail to verify authorization when retrieving cached posts by PendingPostID which allows an authenticated user to read posts in private channels they don't have access to via guessing the PendingPostID of recently created posts.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 13.3%
CVSS Severity
CVSS v3 Score 6.5
References
Products affected by CVE-2025-6226
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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:10.5.2
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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:10.7.0
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cpe:2.3:a:mattermost:mattermost_server:10.7.1
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cpe:2.3:a:mattermost:mattermost_server:10.7.2
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cpe:2.3:a:mattermost:mattermost_server:10.7.3
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cpe:2.3:a:mattermost:mattermost_server:10.8.0
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cpe:2.3:a:mattermost:mattermost_server:10.8.1
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cpe:2.3:a:mattermost:mattermost_server:9.11.0
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cpe:2.3:a:mattermost:mattermost_server:9.11.1
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cpe:2.3:a:mattermost:mattermost_server:9.11.10
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cpe:2.3:a:mattermost:mattermost_server:9.11.11
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cpe:2.3:a:mattermost:mattermost_server:9.11.12
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cpe:2.3:a:mattermost:mattermost_server:9.11.13
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cpe:2.3:a:mattermost:mattermost_server:9.11.14
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cpe:2.3:a:mattermost:mattermost_server:9.11.15
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cpe:2.3:a:mattermost:mattermost_server:9.11.16
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cpe:2.3:a:mattermost:mattermost_server:9.11.2
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cpe:2.3:a:mattermost:mattermost_server:9.11.3
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cpe:2.3:a:mattermost:mattermost_server:9.11.4
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cpe:2.3:a:mattermost:mattermost_server:9.11.5
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cpe:2.3:a:mattermost:mattermost_server:9.11.6
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cpe:2.3:a:mattermost:mattermost_server:9.11.7
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cpe:2.3:a:mattermost:mattermost_server:9.11.8
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cpe:2.3:a:mattermost:mattermost_server:9.11.9