Fortinet FortiMail Path Traversal Vulnerability

Fortinet FortiMail

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. Added to CISA KEV on 2026-10-01 (federal deadline 2026-10-04).

First seen: 1 Oct 2026
Last update: 1 Oct 2026, 12:00 UTC
Identifiers: CVE-2026-104286
CVSS: 9.8
Source: CISA KEV
On the menu as: VPN & firewalls

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## Fortinet FortiMail Path Traversal Vulnerability
Severity: critical, exploited in the wild. Patch status: patched.
Affected: Fortinet FortiMail
Ids: CVE-2026-104286

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. Added to CISA KEV on 2026-10-01 (federal deadline 2026-10-04).

## Steps
1. This touches infrastructure (vpn-edge). Look in terraform, ansible, cloud-init, Dockerfiles and docs for the product and version we run. If it isn't in the repo, say so and list what a human should check on the box.

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2026-104286") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://fortiguard.fortinet.com/psirt/FG-IR-26-175 https://nvd.nist.gov/vuln/detail/CVE-2026-104286
https://pwned.coffee/i/fortinet-fortimail-path-traversal-vulnerability-cve-2026-104286

Sources

Totalone very hot coffee