CVE-2026-104286An 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…
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It affects Fortinet FortiMail. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Oct 1, 2026; federal agencies had to remediate by Oct 4, 2026. Treat that date as your deadline.
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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.
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
- Weakness (CWE)
- CWE-22
- Known exploited
- Added to CISA KEV Oct 1, 2026; federal remediation due Oct 4, 2026Apply 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.
- EPSS (exploitation in the next 30 days)
- 2.20% (percentile 82)
- Assigned by
- fortinet
- NVD analysis
- Analyzed
- Record last updated
- Oct 7, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Fortinet FortiMail fortinet:fortimail | 8.0.0; from 7.6.0 through 7.6.5; from 7.4.0 through 7.4.6; from 7.2.0 through 7.2.9; from 7.0.0 through 7.0.9 | CNA record |
fortinet fortimail fortinet:fortimail | from 7.2.0 through 7.4.8; from 7.6.0 through 7.6.6; from 8.0.0 through 8.0.1 | NVD |
References
- https://fortiguard.fortinet.com/psirt/FG-IR-26-175mitigation, vendor-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-104286us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.