PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-26083 Fortinet CVE debrief

A critical vulnerability, CVE-2026-26083, was found in Fortinet FortiSandbox products, including FortiSandbox 5.0.0 through 5.0.1, FortiSandbox 4.4.0 through 4.4.8, FortiSandbox Cloud 5.0.2 through 5.0.5, and various FortiSandbox PaaS versions. This vulnerability allows an unauthenticated attacker to execute unauthorized code or commands via HTTP requests. The CVSS score for this vulnerability is 9.8, indicating a high severity level. Organizations should prioritize patching to prevent potential unauthorized code execution.

Vendor
Fortinet
Product
FortiSandbox
CVSS
CRITICAL 9.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-12
Original CVE updated
2026-07-08
Advisory published
2026-05-12
Advisory updated
2026-07-08

Who should care

Organizations using Fortinet FortiSandbox products, particularly versions 5.0.0 through 5.0.1, 4.4.0 through 4.4.8, and various PaaS versions, should prioritize patching this vulnerability to prevent potential unauthorized code execution. Security teams and administrators responsible for these systems should take immediate action to assess their exposure and apply necessary mitigations.

Technical summary

CVE-2026-26083 is a missing authorization vulnerability in Fortinet FortiSandbox products. The vulnerability allows an unauthenticated attacker to execute unauthorized code or commands via HTTP requests. Affected products include FortiSandbox 5.0.0 through 5.0.1, FortiSandbox 4.4.0 through 4.4.8, FortiSandbox Cloud 5.0.2 through 5.0.5, and various FortiSandbox PaaS versions. The CVSS vector for this vulnerability is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, indicating a high severity level with a score of 9.8.

Defensive priority

High

Recommended defensive actions

  • Apply patches or updates provided by Fortinet for the affected FortiSandbox products.
  • Restrict access to FortiSandbox products to only trusted networks and users.
  • Monitor FortiSandbox logs for suspicious activity.
  • Consider implementing additional security controls, such as web application firewalls or intrusion detection systems.
  • Review compensating controls for exposed systems while remediation is scheduled and verified.
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review.
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The CVE record was published on 2026-05-12T18:16:39.817Z and was last modified on 2026-07-08T14:16:57.307Z. The NVD entry is currently Analyzed. Evidence is limited to public sources and may not reflect the full scope of affected systems or potential impacts. Defenders should verify the vulnerability's relevance to their specific environments.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-26083 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-26083

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-26083 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-26083

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.