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GHSA-7PF2-9C95-W332 Mattermost doesn't validate file ownership and access control

🗓️ 26 May 2026 13:30:15Reported by GoogleType 
osv_ghsa
 osv_ghsa
🔗 osv.dev👁 18 Views

Mattermost fails to validate file ownership and access control, enabling access to others' files via Boards API.

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Refs
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attackerkb
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22 May 202610:27
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22 May 202612:49
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22 May 202600:00
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22 May 202610:27
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cvelist
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CVE-2026-3473 Improper file ownership validation in the Boards API allows unauthorised file access
22 May 202610:27
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EUVD-2026-31429
22 May 202610:27
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github
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Mattermost doesn't validate file ownership and access control
26 May 202613:30
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22 May 202611:16
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07 Jul 2026 16:11Current
7.3High risk
Vulners AI Score7.3
CVSS 3.17.1
EPSS0.00248
18