Fortinet · FortiMail
CVE-2026-104286
Fortinet FortiMail Path Traversal Vulnerability
What it is
An improper limitation of a pathname to a restricted directory ('path traversal') vulnerability in Fortinet FortiMail 8.0.0 through 8.0.1, FortiMail 7.6.0 through 7.6.6, FortiMail 7.4.0 through 7.4.8, FortiMail 7.2.0 through 7.2.9 may allow an unauthenticated attacker to write arbitrary files on the underlying system via crafted HTTP or HTTPS requests.
CISA: Fortinet FortiMail contains a path traversal and an improper neutralization of NULL byte or NULL character vulnerability that may allow an unauthenticated attacker to write arbitrary files on the underlying system via crafted HTTP or HTTPS requests.
What to do
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Deadline for US federal agencies: October 4, 2026
- Added to the CISA list
- October 1, 2026
- Published
- October 1, 2026
- Severity
- Critical 9.8 CVSS 3.1
- Chance of attacks in the next 30 days (EPSS)
- 4.6% in the top 8.4% of all known vulnerabilities
- Weakness
- CWE-22 CWE-158
- More details
- NVD · CVE.org · CISA
All references (1)
More exploited flaws from Fortinet
| Added | Vulnerability | Product | Severity | Attack chance |
|---|---|---|---|---|
| Oct 16, 2026 | Path Traversal | Multiple Products | Medium 5.4 | 1.3% |
| Sep 9, 2026 | Heap-based Buffer Overflow | Multiple Products | High 7.4 | 3.7% |
| Jul 27, 2026 | Exposure of Sensitive Information to an Unauthorized Actor | FortiOS | Medium 5.3 | 29% |
| Jul 16, 2026 | OS Command Injection | FortiSandbox | Critical 9.1 | 76% |
| Jul 16, 2026 | OS Command Injection | FortiSandbox | Critical 9.1 | 93% |
| Apr 13, 2026 | SQL Injection | FortiClient EMS | Critical 9.1 | 98% |
| Apr 6, 2026 | Improper Access Control | FortiClient EMS | Critical 9.1 | 94% |
| Jan 27, 2026 | Authentication Bypass Using an Alternate Path or Channel | Multiple Products | Critical 9.4 | 87% |
Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.