Auth-bypass RCE in a widely deployed Fortinet security appliance that enables full appliance compromise and lateral movement; high impact for enterprise networks.
CVE-2026-107656
Auth bypass RCE in Fortinet FortiSandbox enabling unauthorized code execution.
Is CVE-2026-107656 being exploited?
Not confirmed. CVE-2026-107656 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.85% probability of exploitation in the next 30 days.
How severe is CVE-2026-107656?
CVE-2026-107656 is rated Critical with a CVSS score of 9.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-107656?
Not known from our data. No patch reference has been recorded for CVE-2026-107656, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-107656 affect?
CVE-2026-107656 affects FortiSandbox 5.0.0 - 5.0.6, FortiSandbox 4.4.0 - 4.4.9, FortiSandbox 4.2 (all), FortiSandbox PaaS 5.0.0 - 5.0.6, and 2 further products or versions. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-107656?
Isolate affected appliances, block HTTP access, monitor logs, apply vendor patch when available.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authentication bypass via crafted HTTP requests allows remote code/command execution, full appliance compromise and lateral movement.
Immediate action required
- affected>= 5.0.0 and <= 5.0.6
- affected>= 4.4.0 and <= 4.4.9
- affected>= 4.2.1 and <= 4.2.8
- affected>= 5.0.0 and <= 5.0.6
- affected>= 4.4.0 and <= 4.4.9
- affected>= 4.2.1 and <= 4.2.8
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.