The vulnerability of the Mattermost instant messaging application, related to insufficient protection of operational data, allows a malicious actor to gain unauthorized access to protected information.
🗓️ 17 Dec 2025 00:00:00Reported by FSTEC of Russia — Information Security Threat DatabaseType 
bdu_fstec🔗 bdu.fstec.ru👁 6 Views
| Reporter | Title | Published | Views | Family All 17 |
|---|---|---|---|---|
 | CVE-2025-55074 | 18 Nov 202517:22 | – | circl |
 | Mattermost 安全漏洞 | 18 Nov 202500:00 | – | cnnvd |
 | CVE-2025-55074 | 18 Nov 202515:23 | – | cve |
 | CVE-2025-55074 Channel member objects leak read status | 18 Nov 202515:23 | – | cvelist |
 | EUVD-2025-198045 | 18 Nov 202518:32 | – | euvd |
 | Mattermost allows other users to determine when users had read channels via channel member objects | 18 Nov 202518:32 | – | github |
 | CVE-2025-55074 | 18 Nov 202516:15 | – | nvd |
 | GHSA-9HH7-6558-QFP2 Mattermost allows other users to determine when users had read channels via channel member objects | 18 Nov 202518:32 | – | osv |
| GO-2025-4133 Mattermost allows other users to determine when users had read channels via channel member objects in github.com/mattermost/mattermost-server | 25 Nov 202518:12 | – | osv |
| OPENSUSE-SU-2026:21483-1 Security update for govulncheck-vulndb | 30 Jul 202609:09 | – | osv |
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17 Dec 2025 00:00Current
5.8Medium risk
Vulners AI Score5.8
CVSS 22.1
CVSS 33
EPSS0.00169