CVE-2026-104286 Fortinet FortiMail - Path Traversal

Fortinet FortiMail 7.2.0 through 7.2.9, 7.4.0 through 7.4.8, 7.6.0 through 7.6.6, and 8.0.0 through 8.0.1 contain a path traversal vulnerability caused by improper limitation of pathname in HTTP/HTTPS request handling, letting unauthenticated attackers write arbitrary files on the system, exploit requires crafted HTTP/HTTPS requests.

CVSS base score 9.8 /10
Critical
CISA KEV
Exploited in the wild
Public exploit
Proof of concept available
Authentication
Not required
EPSS
2.20% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Path Traversal
Impact
File System Write
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
1 October 2026
Updated
15 October 2026
Weakness
CWE-22

Vendor fix

Update to the latest FortiMail version beyond 8.0.1.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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