Mattermost Authentication Bypass
🗓️ 20 Apr 2026 00:00:00Reported by FSTEC of Russia — Information Security Threat DatabaseType 
bdu_fstec🔗 bdu.fstec.ru👁 32 Views
| Reporter | Title | Published | Views | Family All 20 |
|---|---|---|---|---|
 | CVE-2026-27769 | 15 Apr 202610:11 | – | attackerkb |
 | CVE-2026-27769 | 15 Apr 202612:30 | – | circl |
 | Mattermost security vulnerabilities | 15 Apr 202600:00 | – | cnnvd |
 | CVE-2026-27769 | 15 Apr 202610:11 | – | cve |
 | CVE-2026-27769 Connected Workspaces: Malicious remote server can manipulate arbitrary user's status | 15 Apr 202610:11 | – | cvelist |
 | EUVD-2026-22873 | 17 Apr 202615:31 | – | euvd |
 | Mattermost doesn't validate whether users were correctly owned by the correct Connected Workspace | 17 Apr 202615:31 | – | github |
 | Mattermost Server 10.11.x < 10.11.13 Improper Validation (MMSA-2026-00603) | 24 Apr 202600:00 | – | nessus |
 | CVE-2026-27769 | 15 Apr 202610:11 | – | mend |
 | CVE-2026-27769 | 15 Apr 202611:16 | – | nvd |
10
Node
OR
| Source | Link |
|---|---|
| mattermost | www.mattermost.com/security-updates |
| web | www.web.nvd.nist.gov/view/vuln/detail |
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20 Apr 2026 00:00Current
8.6High risk
Vulners AI Score8.6
CVSS 32.7
CVSS 24
EPSS0.00267