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2026-10-31 · critical
CVE-2026-107656: Authentication Bypass in FortiSandbox
RCE via authentication bypass in FortiSandbox 5.0, 4.4, 4.2, and PaaS. CVSS 9.8 critical. Patches available.
CVE-2026-107656 is an authentication bypass in Fortinet FortiSandbox 5.0.0-5.0.6, 4.4.0-4.4.9, 4.2 (all versions), and PaaS variants (5.0.0-5.0.6, 4.4, and 4.2). The vulnerability allows unauthenticated attackers to bypass access controls through alternate HTTP paths and execute unauthorized code or commands on affected systems.
CVSS score is 9.8 (critical), indicating high risk of remote code execution with low exploit complexity. The vulnerability was published to NVD on October 26, 2026. As of October 31, 2026, public GitHub repositories declare containing Python detectors for automated identification of vulnerable FortiSandbox instances, signaling rising attention in the infosec community.
System administrators must immediately verify FortiSandbox and FortiSandbox PaaS versions in use, consult official Fortinet advisories for patch availability, and implement network rules restricting HTTP/HTTPS access to FortiSandbox appliances to authorized sources only. Monitoring HTTP logs to FortiSandbox for suspicious requests is essential for detecting exploitation attempts.
At a glance
- What
- Authentication bypass via alternate path/channel in Fortinet FortiSandbox. Unauthenticated attackers can execute code/commands via crafted HTTP requests.
- Severity
- CVSS 9.8 (critical). Remote code execution (RCE) with low exploit complexity.
- Affected versions
- FortiSandbox 5.0.0-5.0.6, 4.4.0-4.4.9, 4.2 (all), FortiSandbox PaaS 5.0.0-5.0.6, 4.4 (all), 4.2 (all)
- Fix
- not reported
- Status
- Vulnerability published to NVD on October 26, 2026. GitHub repositories contain Python detectors for automated detection (October 31, 2026).
- Action
- Verify installed FortiSandbox versions. Search for Fortinet patches. Monitor suspicious HTTP requests to FortiSandbox appliances. Apply network restrictions.
Sources: NVD, CVE-2026-107656