Vulnerability Details CVE-2026-3524
Mattermost Plugin Legal Hold versions <=1.1.4 fail to halt request processing after a failed authorization check in ServeHTTP which allows an authenticated attacker to access, create, download, and delete legal hold data via crafted API requests to the plugin's endpoints. Mattermost Advisory ID: MMSA-2026-00621
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 30.6%
CVSS Severity
CVSS v3 Score 8.8
References
Products affected by CVE-2026-3524
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cpe:2.3:a:mattermost:legal_hold:0.1.0
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cpe:2.3:a:mattermost:legal_hold:0.2.0
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cpe:2.3:a:mattermost:legal_hold:0.3.0
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cpe:2.3:a:mattermost:legal_hold:0.3.1
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cpe:2.3:a:mattermost:legal_hold:0.3.2
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cpe:2.3:a:mattermost:legal_hold:0.3.3
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cpe:2.3:a:mattermost:legal_hold:0.3.4
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cpe:2.3:a:mattermost:legal_hold:0.4.0
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cpe:2.3:a:mattermost:legal_hold:0.4.1
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cpe:2.3:a:mattermost:legal_hold:0.4.2
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cpe:2.3:a:mattermost:legal_hold:0.4.3
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cpe:2.3:a:mattermost:legal_hold:0.5.0
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cpe:2.3:a:mattermost:legal_hold:1.0.0
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cpe:2.3:a:mattermost:legal_hold:1.0.1
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cpe:2.3:a:mattermost:legal_hold:1.0.2
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cpe:2.3:a:mattermost:legal_hold:1.1.0
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cpe:2.3:a:mattermost:legal_hold:1.1.1
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cpe:2.3:a:mattermost:legal_hold:1.1.2
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cpe:2.3:a:mattermost:legal_hold:1.1.3
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cpe:2.3:a:mattermost:legal_hold:1.1.4