The vulnerability of the Boards API (Focalboard) interface of the Mattermost instant messaging application, which allows a malicious user to gain unauthorized access to protected information.
🗓️ 01 Jun 2026 00:00:00Reported by FSTEC of Russia — Information Security Threat DatabaseType 
bdu_fstec🔗 bdu.fstec.ru👁 16 Views
| Reporter | Title | Published | Views | Family All 19 |
|---|---|---|---|---|
 | CVE-2026-3473 | 22 May 202610:27 | – | attackerkb |
 | CVE-2026-3473 | 22 May 202612:49 | – | circl |
 | Mattermost 安全漏洞 | 22 May 202600:00 | – | cnnvd |
 | CVE-2026-3473 | 22 May 202610:27 | – | cve |
 | CVE-2026-3473 Improper file ownership validation in the Boards API allows unauthorised file access | 22 May 202610:27 | – | cvelist |
 | EUVD-2026-31429 | 22 May 202610:27 | – | euvd |
 | Mattermost doesn't validate file ownership and access control | 26 May 202613:30 | – | github |
 | CVE-2026-3473 | 22 May 202610:27 | – | mend |
 | CVE-2026-3473 | 22 May 202611:16 | – | nvd |
 | GHSA-7PF2-9C95-W332 Mattermost doesn't validate file ownership and access control | 26 May 202613:30 | – | osv |
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01 Jun 2026 00:00Current
8.2High risk
Vulners AI Score8.2
CVSS 37.1
CVSS 27.5
EPSS0.00248