Fortinet FortiSandbox auth bypass flaw patched
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Fortinet fixed a critical authentication bypass in FortiSandbox web management allowing unauthenticated remote code execution; CVSS 9.8.
NCSC-NL published an advisory covering three vulnerabilities patched by Fortinet in FortiSandbox. The most severe, CVE-2026-107656 (CVSS 9.8), is an authentication bypass in the FortiSandbox web management interface. An unauthenticated attacker can send specially crafted HTTP requests to bypass authentication and execute unauthorized code or commands, making this a critical risk for any internet- or network-exposed FortiSandbox management interface.
Two additional medium-severity issues were also addressed: CVE-2026-106172, a hard-coded cryptographic key in the Fabric API that could allow an unauthenticated attacker to gain elevated privileges, and CVE-2026-106170, an uncaught exception that a privileged attacker could exploit to persistently disrupt GUI and CLI functionality.
Fortinet has released updates to remediate all three vulnerabilities, with corresponding update or migration guidance for FortiSandbox PaaS deployments. No in-the-wild exploitation is mentioned in the advisory. Defenders running FortiSandbox should prioritize patching, especially given the unauthenticated, pre-auth nature of the critical bypass, and restrict management interface exposure as a compensating control where immediate patching is not possible.
Mentioned in this report
Source reporting: https://advisories.ncsc.nl/2026/ncsc-2026-0428.html
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