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Mattermost doesn't validate file ownership and access control

🗓️ 26 May 2026 13:30:15Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 26 Views

Mattermost fails to validate file ownership and access control, enabling authenticated users to download others’ files.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
attackerkb
attackerkb
CVE-2026-3473
22 May 202610:27
–attackerkb
bdu_fstec
BDU FSTEC
Boards API Focalboard Unauthorized Access
1 Jun 202600:00
–bdu_fstec
circl
Circl
CVE-2026-3473
22 May 202612:49
–circl
cnnvd
CNNVD
Mattermost security vulnerabilities
22 May 202600:00
–cnnvd
cve
CVE
CVE-2026-3473
22 May 202610:27
–cve
cvelist
Cvelist
CVE-2026-3473 Improper file ownership validation in the Boards API allows unauthorised file access
22 May 202610:27
–cvelist
euvd
EUVD
EUVD-2026-31429
22 May 202610:27
–euvd
mend
Mend
CVE-2026-3473
22 May 202610:27
–mend
nvd
NVD
CVE-2026-3473
22 May 202611:16
–nvd
osv_cve
osv_cve
CVE-2026-3473 Improper file ownership validation in the Boards API allows unauthorised file access
22 May 202610:27
–osv_cve
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26 Jun 2026 22:48Current
7.3High risk
Vulners AI Score7.3
CVSS 3.15.9 - 7.1
EPSS0.00149
SSVC
26