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CVE-2026-126148 fortinet fortimail: OS Command Injection

9.8 criticalEPSS 2.4%

Critical (9.8) in fortinet fortimail. EPSS 2.4% estimated probability of exploitation activity in the next 30 days.

On this page
A improper neutralization of special elements used in an os command ('os command injection') vulnerability in Fortinet FortiMail 8.0.0 through 8.0.1, FortiMail 7.6.0 through 7.6.6 may allow an unauthenticated attacker to execute unauthorized code or commands via crafted HA join-request packets.

Severity

CVSS 3.1

9.8 critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
2.4% estimated probability of exploitation activity in the next 30 days; 85th percentile. Scored 2026-11-13. A forecast for this CVE across the internet, not for your own systems.
CWE
CWE-78 Improper Neutralization of Special Elements used in an OS Command (OS Command Injection)
OWASP Top 10
A05:2025 Injection
Published
Modified
Assigned by
fortinet (CNA)
NVD analysis
Awaiting analysis
Record from
the NVD, synced

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Affected

Versions

From the CNA's record in the CVE List.

ProductAffected
Fortinet FortiMailfrom 8.0.0 through 8.0.1
Fortinet FortiMailfrom 7.6.0 through 7.6.6

GitHub PoC (unverified)

Repositories on GitHub named after this CVE. Nobody has checked them and they are not scanned: some hold a working proof of concept, some nothing useful, and some malware made to look like one. Read the code before you run any of it.

  • googlesky/CVE-2026-126148 0 stars, Python, created
    Containerised PoC for CVE-2026-126148 (Fortinet FG-IR-26-200): an OS command injection (CWE-78) in the FortiMail HA cluster lets one unauth…

Attack patterns (CAPEC)

  • CAPEC-6 Argument Injection Likelihood: High · Severity: High
  • CAPEC-15 Command Delimiters Likelihood: High · Severity: High
  • CAPEC-43 Exploiting Multiple Input Interpretation Layers Likelihood: Medium · Severity: High
  • CAPEC-88 OS Command Injection Likelihood: High · Severity: High
  • CAPEC-108 Command Line Execution through SQL Injection Likelihood: Low · Severity: Very High

The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits.

References

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