Mattermost Authentication Bypass File Upload
🗓️ 13 May 2026 00:00:00Reported by FSTEC of Russia — Information Security Threat DatabaseType 
bdu_fstec🔗 bdu.fstec.ru👁 36 Views
| Reporter | Title | Published | Views | Family All 20 |
|---|---|---|---|---|
 | CVE-2026-4265 | 16 Mar 202612:07 | – | attackerkb |
 | CVE-2026-4265 | 17 Mar 202600:00 | – | circl |
 | Mattermost 安全漏洞 | 16 Mar 202600:00 | – | cnnvd |
 | CVE-2026-4265 | 16 Mar 202612:07 | – | cve |
 | CVE-2026-4265 Guest user can upload files without permission across teams | 16 Mar 202612:07 | – | cvelist |
 | EUVD-2026-12425 | 16 Mar 202615:30 | – | euvd |
 | Mattermost fails to validate team-specific upload_file permissions | 16 Mar 202615:30 | – | github |
 | CVE-2026-4265 | 16 Mar 202612:07 | – | mend |
 | CVE-2026-4265 | 16 Mar 202614:20 | – | nvd |
 | GHSA-XPVF-6QCC-9JQC Mattermost fails to validate team-specific upload_file permissions | 16 Mar 202615:30 | – | osv_ghsa |
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Node
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| Source | Link |
|---|---|
| mattermost | www.mattermost.com/security-updates |
| web | www.web.nvd.nist.gov/view/vuln/detail |
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13 May 2026 00:00Current
7.5High risk
Vulners AI Score7.5
CVSS 24
CVSS 34.3
EPSS0.00379