Mattermost: Insufficient server-side validation of board member role fields permits privilege escalation Classification: Severe, Solution: Official Fix, Exploit Maturity: Not Defined, CVSSv3.1: 8.3, CVEs: CVE-2026-9816, Summary: Mattermost versions 11.7.x EPSS 0.00 CVSS 8.3 CVE-2026-9816 Mattermost FI CA 2 zdrojů NCSC-FI 19. 8. 04:00 · Cyber Centre Kanada 18. 8. 16:14