Mattermost doesn't validate the X-Requested-With header on the burn-on-read reveal endpoint
| Reporter | Title | Published | Views | Family All 19 |
|---|---|---|---|---|
 | CVE-2026-6339 | 18 May 202608:05 | – | attackerkb |
 | CVE-2026-6339 | 18 May 202614:54 | – | circl |
 | Mattermost access control vulnerability | 18 May 202600:00 | – | cnnvd |
 | CVE-2026-6339 | 18 May 202608:05 | – | cve |
 | CVE-2026-6339 Missing request origin validation on burn-on-read reveal endpoint | 18 May 202608:05 | – | cvelist |
 | EUVD-2026-30749 | 18 May 202608:05 | – | euvd |
 | Mattermost Server 11.4.x <= 11.4.3 / 11.5.x <= 11.5.1 Origin Validation Error (MMSA-2026-00636) | 22 May 202600:00 | – | nessus |
 | CVE-2026-6339 | 18 May 202608:05 | – | mend |
 | CVE-2026-6339 | 18 May 202609:16 | – | nvd |
 | CVE-2026-6339 Missing request origin validation on burn-on-read reveal endpoint | 18 May 202608:05 | – | osv_cve |
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01 Jun 2026 15:22Current
8.2High risk
Vulners AI Score8.2
CVSS 3.14.3
EPSS0.00113
SSVC