Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2026-25089

FortiSandbox Os command injection

Fortinet / FortiSandbox · 5.0.0 to <= 5.0.5

Watch CVE-2026-25089 Browse KEV feed
Severity
CVSS 9.1 · Critical
Confidence
Confirmed
Exploit status
Exploited in the wild
EPSS
76.1%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-25089 is an unauthenticated vulnerability affecting Fortinet FortiSandbox and 2 other products. A improper neutralization of special elements used in an os command ('os command injection') vulnerability in...

Is it exploited?

Yes. Previdian tracks this CVE as a known exploited vulnerability. Confidence is confirmed. Listed in CISA KEV. Also confirmed by third-party sources.

Who is affected?

Fortinet / FortiSandbox 5.0.0 to <= 5.0.5.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

FortiSandbox Os command injection

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

Fortinet Affected
FortiSandbox
Through 5.0.5 Through 4.4.8 Through 4.2.8
Fortinet Affected
FortiSandbox Cloud
Through 5.0.5
Fortinet Affected
FortiSandbox PaaS
Through 5.0.5
Published
09 Jun 2026
Exploitation Reported
16 Jul 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

edge cisa

CVE References

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CISA

Recorded 16 Jul 2026

A trusted third party reported exploitation.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

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Source Added
All CISA Advisories First 2026-07-16 12:00 UTC
CISA 2026-07-16 17:00 UTC
CVE 2026-07-16 17:51 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts
0
0
0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

9.1 Critical

Potential damage if exploited. Separate from whether attackers are using it.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C

EPSS

76.1%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') CWE-78

Recent mention · All CISA Advisories

CISA Adds Three Known Exploited Vulnerabilities to Catalog

CISA has added three new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation. CVE-2026-25089 Fortinet FortiSandbox OS Command Injection Vulnerability   CVE-2026-39808 Fortinet FortiSandbox OS Command Injection...

Read full advisory

All Mentions

Recent mention · All CISA Advisories

CISA Adds Three Known Exploited Vulnerabilities to Catalog

All CISA Advisories · 16 Jul 2026

CISA has added three new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation. CVE-2026-25089 Fortinet FortiSandbox OS Command Injection Vulnerability   CVE-2026-39808 Fortinet FortiSandbox OS Command Injection Vulnerability   CVE-2026-58644 Microsoft SharePoint Deserialization of Untrusted Data Vulnerability These types of vulnerabilities are frequent attack vectors for malicious cyber actors and pose significant risks to the federal enterprise. Binding Operational Directive (BOD) 26-04: Prioritizing Security Updates Based on Risk...

Recent mention · The Hacker News

Attackers Exploit Three Fortinet FortiSandbox Flaws, One Patched Last Week

The Hacker News · 16 Jun 2026

Bad actors are exploiting multiple security vulnerabilities in Fortinet FortiSandbox, according to threat intelligence firm Defused Cyber. In a post shared on X, the company said it has observed exploitation of CVE-2026-39813, CVE-2026-39808, and CVE-2026-25089 over the past 24 hours. CVE-2026-39813 (CVSS score: 9.1) refers to a path traversal vulnerability in FortiSandbox JRPC API that could

Recent mention · The Hacker News

Ivanti, Fortinet, and SAP Release Patches for Multiple Critical Vulnerabilities

The Hacker News · 10 Jun 2026

Fortinet, Ivanti, and SAP have released security updates to address multiple critical security vulnerabilities that could result in arbitrary code execution and information disclosure. The security flaw patched by Fortinet relates to a command injection vulnerability in FortiSandbox, FortiSandbox Cloud, and FortiSandbox PaaS WEB UI. It's tracked as CVE-2026-25089 (CVSS score: 9.1). "An

Recent mention · Daily CyberSecurity

Critical FortiSandbox Flaw Requires Immediate Patching

Daily CyberSecurity · 10 Jun 2026

A critical security vulnerability tracks as CVE-2026-25089 inside the Fortinet ecosystem. This dangerous flaw scores a high 9.1 The post Critical FortiSandbox Flaw Requires Immediate Patching appeared first on Daily CyberSecurity. Related posts: High-Severity Cacti Flaw (CVE-2025-66399) Risks Remote Code Execution via SNMP Community String Injection Under Active Attack: Critical 9.1 CVSS FortiClient EMS Flaw Exploited in the Wild Critical 9.1 Flaws Hit Fortinet FortiSandbox

Timeline

From disclosure to observed exploitation

  1. 17:51 UTC

    KEV confirmed by CVE

    Exploitation attested by an external source

  2. 17:00 UTC

    Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  3. 12:00 UTC

    Added to Previdian KEV Feed

    High-confidence, third-party attested exploitation

  4. 14:27 UTC

    CVE published

    Vulnerability disclosed publicly

  5. 09:27 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-25089

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2026-25089",
  "confidence": "Confirmed",
  "cvss_score": 9.1,
  "cvss_estimated": false,
  "epss_score": 0.76112,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}