How severe is CVE-2026-25089?

CVE-2026-25089 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-25089 being actively exploited?

Yes. CVE-2026-25089 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-07-16, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2026-25089?

CVE-2026-25089 primarily affects Fortinet Fortisandbox. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-25089?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2026-25089 have an EU (EUVD) identifier?

Yes. CVE-2026-25089 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-35443.

When was CVE-2026-25089 published?

CVE-2026-25089 was published on 2026-06-09 and last updated on 2026-07-23.

CVE-2026-25089

CVE-2026-25089 is a critical-severity vulnerability in Fortinet Fortisandbox with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2026-07-16). The underlying weakness is classified as CWE-78.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 74% (99th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2026-07-16)
EU (EUVD) id: EUVD-2026-35443
Weakness: CWE-78
Affected product: Fortinet Fortisandbox
Published: 2026-06-09
Last modified: 2026-07-23

Description

A improper neutralization of special elements used in an os command ('os command injection') vulnerability in Fortinet FortiSandbox 5.0.0 through 5.0.5, FortiSandbox 4.4.0 through 4.4.8, FortiSandbox 4.2 all versions, FortiSandbox Cloud 5.0.4 through 5.0.5, FortiSandbox PaaS 5.0.4 through 5.0.5 may allow an unauthenticated attacker to execute unauthorized commands via specifically crafted HTTP requests

Frequently asked questions

What is CVE-2026-25089?: A improper neutralization of special elements used in an os command ('os command injection') vulnerability in Fortinet FortiSandbox 5.0.0 through 5.0.5, FortiSandbox 4.4.0 through 4.4.8, FortiSandbox 4.2 all versions, FortiSandbox Cloud 5.0.4 through 5.0.5, FortiSandbox PaaS 5.0.4 through 5.0.5 may allow an unauthenticated attacker to execute unauthorized commands via specifically crafted HTTP requests
How severe is CVE-2026-25089?: CVE-2026-25089 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-25089 being actively exploited?: Yes. CVE-2026-25089 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-07-16, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2026-25089?: CVE-2026-25089 primarily affects Fortinet Fortisandbox. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-25089?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2026-25089 have an EU (EUVD) identifier?: Yes. CVE-2026-25089 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-35443.
When was CVE-2026-25089 published?: CVE-2026-25089 was published on 2026-06-09 and last updated on 2026-07-23.

References

Affected products (3)

cpe:2.3:a:fortinet:fortisandbox:*:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:fortisandbox_cloud:*:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:fortisandbox_paas:*:*:*:*:*:*:*:*

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