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?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 23% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

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. Given its critical severity, prioritise patching exposed systems.

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 2026-06-17.

CVE-2026-25089

CVE-2026-25089 is a critical-severity vulnerability in Fortinet Fortisandbox with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 23% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-78.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 23% (98th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-35443
Weakness: CWE-78
Affected product: Fortinet Fortisandbox
Published: 2026-06-09
Last modified: 2026-06-17

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?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 23% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
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. Given its critical severity, prioritise patching exposed systems.
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 2026-06-17.

References

https://fortiguard.fortinet.com/psirt/FG-IR-26-141

Affected products (3)

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

More vulnerabilities in Fortinet Fortisandbox

CVE-2026-26083 — Critical (CVSS 9.8): A missing authorization vulnerability in Fortinet FortiSandbox 5.0.0 through 5.0.1, FortiSandbox 4.4.0 through 4.4.8,…
CVE-2026-39813 — Critical (CVSS 9.8): A path traversal: '../filedir' vulnerability in Fortinet FortiSandbox 5.0.0 through 5.0.5, FortiSandbox 4.4.0 through…
CVE-2026-39808 — Critical (CVSS 9.8): A improper neutralization of special elements used in an os command ('os command injection') vulnerability in Fortinet…
CVE-2025-52436 — High (CVSS 8.8): An Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability [CWE-79]…
CVE-2024-52961 — High (CVSS 8.8): An improper neutralization of special elements used in an OS Command vulnerability [CWE-78] vulnerability in Fortinet…
CVE-2024-27778 — High (CVSS 8.8): An improper neutralization of special elements used in an OS Command vulnerability [CWE-78] vulnerability in Fortinet…

All CVEs affecting Fortinet Fortisandbox →

Other CWE-78 (OS Command Injection) vulnerabilities

CVE-2026-56004 — Critical (CVSS 10.0): A shellcode injection in the mercurial handler of the obs tar_scm source service before version 0.12.4 could be used by…
CVE-2026-56415 — Critical (CVSS 10.0): Storage Concentrator (SC & SCVM) contains a command injection vulnerability within the debug.pl script that is…
CVE-2026-56413 — Critical (CVSS 10.0): Storage Concentrator (SC & SCVM) contains a command injection vulnerability in the ms_service.pl service, which listens…
CVE-2026-49869 — Critical (CVSS 10.0): Kestra is an open-source, event-driven orchestration platform. Prior to 1.0.45 and 1.3.21, AuthenticationFilter in…
CVE-2026-49261 — Critical (CVSS 10.0): MariaDB server is a community developed fork of MySQL server. Versions 10.6.1 through 10.6.26, 10.11.1 through…
CVE-2026-10520 — Critical (CVSS 10.0): An OS Command Injection vulnerability in Ivanti Sentry before the R10.5.2, R10.6.2 and R10.7.1 versions allows a…

Browse all CWE-78 (OS Command Injection) vulnerabilities →