Is CVE-2026-26084 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-26084 being exploited in the wild.

How severe is CVE-2026-26084?

Critical severity, with a CVSS score of 9.9, published 8 September 2026.

Which products and versions are affected?

Fortinet FortiSandbox 5.0.0 through 5.0.5, 4.4.0 through 4.4.8; Fortinet FortiSandbox PaaS 5.0.4 through 5.0.5; Fortinet Fortisandbox Cloud 5.0.4 through 5.0.5.

Is there a fix for CVE-2026-26084?

A patch was published on 2026-09-08: FortiSandbox 5.0.6+, 4.4.9+; Cloud/PaaS 5.0.6+ Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-26084 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-26084?

Check whether you run Fortinet FortiSandbox, Fortinet FortiSandbox PaaS or Fortinet Fortisandbox Cloud at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-26084: Fortinet FortiSandbox improper access control in web UI

CVE-2026-26084 · Severity: critical · CVSS 9.9 · Published 2026-09-08

Fortinet FortiSandbox is a malware analysis and threat detection platform used to protect organizations against advanced threats. An improper access control flaw in the web interface allows unauthenticated attackers to access sensitive information by sending crafted HTTP requests, potentially exposing confidential data without requiring credentials or authentication.

Technologies: Fortinet FortiSandbox, Fortinet FortiSandbox PaaS, Fortinet Fortisandbox Cloud. Vendors: Fortinet.

Quick answers

Is CVE-2026-26084 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-26084 being exploited in the wild.
How severe is CVE-2026-26084?: Critical severity, with a CVSS score of 9.9, published 8 September 2026.
Which products and versions are affected?: Fortinet FortiSandbox 5.0.0 through 5.0.5, 4.4.0 through 4.4.8; Fortinet FortiSandbox PaaS 5.0.4 through 5.0.5; Fortinet Fortisandbox Cloud 5.0.4 through 5.0.5.
Is there a fix for CVE-2026-26084?: A patch was published on 2026-09-08: FortiSandbox 5.0.6+, 4.4.9+; Cloud/PaaS 5.0.6+ Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-26084 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-26084?: Check whether you run Fortinet FortiSandbox, Fortinet FortiSandbox PaaS or Fortinet Fortisandbox Cloud at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

This is an improper access control vulnerability (CWE-284) in the FortiSandbox, FortiSandbox Cloud, and FortiSandbox PaaS web UI that allows unauthenticated attackers to bypass authentication controls. The vulnerability is triggered through crafted HTTP requests that can manipulate NAT rules and gain unauthorized access to sensitive information. The attack requires no authentication and is network-reachable via the web interface. Fortinet has released patches: FortiSandbox 5.0.6 and above, FortiSandbox 4.4.9 and above, and corresponding cloud/PaaS versions (5.0.6 and above). No known active exploitation has been reported as of the advisory date.

Affected products

Fortinet FortiSandbox 5.0.0 through 5.0.5, 4.4.0 through 4.4.8
Fortinet FortiSandbox Cloud 5.0.4 through 5.0.5
Fortinet FortiSandbox PaaS 5.0.4 through 5.0.5

Timeline

2026-09-08: disclosed
2026-09-08: patched: FortiSandbox 5.0.6+, 4.4.9+; Cloud/PaaS 5.0.6+

References

https://fortiguard.fortinet.com/psirt/FG-IR-26-166

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