Vulnerability Details CVE-2026-19600
Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10, 11.10.x <= 11.10.1 fail to sanitize authentication tokens before writing them to server log entries, which allows an attacker with access to server logs to obtain valid session tokens or OAuth access tokens and impersonate authenticated users via the debug-level Mattermost server log.. Mattermost Advisory ID: MMSA-2026-00763
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 14.6%
CVSS Severity
CVSS v3 Score 4.5
References
Products affected by CVE-2026-19600
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cpe:2.3:a:mattermost:mattermost_server:11.10.0
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cpe:2.3:a:mattermost:mattermost_server:11.10.1
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cpe:2.3:a:mattermost:mattermost_server:11.7.0
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cpe:2.3:a:mattermost:mattermost_server:11.7.1
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cpe:2.3:a:mattermost:mattermost_server:11.7.2
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cpe:2.3:a:mattermost:mattermost_server:11.7.3
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cpe:2.3:a:mattermost:mattermost_server:11.7.4
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cpe:2.3:a:mattermost:mattermost_server:11.7.5
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cpe:2.3:a:mattermost:mattermost_server:11.7.6
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cpe:2.3:a:mattermost:mattermost_server:11.7.7
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cpe:2.3:a:mattermost:mattermost_server:11.7.8
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cpe:2.3:a:mattermost:mattermost_server:11.7.9
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cpe:2.3:a:mattermost:mattermost_server:11.8.0
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cpe:2.3:a:mattermost:mattermost_server:11.8.1
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cpe:2.3:a:mattermost:mattermost_server:11.8.2
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cpe:2.3:a:mattermost:mattermost_server:11.8.3
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cpe:2.3:a:mattermost:mattermost_server:11.8.4
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cpe:2.3:a:mattermost:mattermost_server:11.8.5
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cpe:2.3:a:mattermost:mattermost_server:11.9.0
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cpe:2.3:a:mattermost:mattermost_server:11.9.1