Vulnerability Details CVE-2026-4858
Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to check integration URL for path traversal which allows an malicious authenticated user to call an arbitrary API via system admin Mattermost auth token using via path traversal in integration action URL.. Mattermost Advisory ID: MMSA-2026-00640
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 14.5%
CVSS Severity
CVSS v3 Score 8.0
References
Products affected by CVE-2026-4858
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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:10.11.10
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cpe:2.3:a:mattermost:mattermost_server:10.11.11
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cpe:2.3:a:mattermost:mattermost_server:10.11.12
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cpe:2.3:a:mattermost:mattermost_server:10.11.13
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cpe:2.3:a:mattermost:mattermost_server:10.11.14
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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:10.11.7
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cpe:2.3:a:mattermost:mattermost_server:10.11.8
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cpe:2.3:a:mattermost:mattermost_server:10.11.9
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cpe:2.3:a:mattermost:mattermost_server:11.4.0
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cpe:2.3:a:mattermost:mattermost_server:11.4.1
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cpe:2.3:a:mattermost:mattermost_server:11.4.2
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cpe:2.3:a:mattermost:mattermost_server:11.4.3
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cpe:2.3:a:mattermost:mattermost_server:11.4.4
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cpe:2.3:a:mattermost:mattermost_server:11.5.0
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cpe:2.3:a:mattermost:mattermost_server:11.5.1
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cpe:2.3:a:mattermost:mattermost_server:11.5.2
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cpe:2.3:a:mattermost:mattermost_server:11.5.3
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cpe:2.3:a:mattermost:mattermost_server:11.6.0