Exploited vulnerability

CVE-2026-104286

TLP:CLEAR

Fortinet FortiMail Path Traversal Vulnerability

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.

Facts

Vendor: Fortinet
Product: FortiMail
CVSS: 9.8
EPSS (probability of exploitation within 30 days): 4.6 %
On CISA's Known Exploited Vulnerabilities list since: 1 October 2026
First known exploitation: 1 October 2026
CISA's deadline for US federal agencies: 4 October 2026
Weakness: CWE-22
First seen by Risk Letters: 1 October 2026

Members see which Nordic sectors the flaw hits, and what to do about it.

Get the full brief

Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD