Three critical Fortinet sandbox bugs splattered by unknown attackers

Three critical vulnerabilities in Fortinet's FortiSandbox are being actively exploited by unknown attackers. Fortinet has patched two of the flaws (CVE-2026-39813 and CVE-2026-39808) in April and a third (CVE-2026-25089) last week, all rated 9.1 on the CVSS scale. Threat intelligence firm Defused reported ongoing exploitation attempts, including unpatched vulnerabilities allowing remote code execution and authentication bypass.