Fortinet

CVE-2026-126163: A use of externally-controlled format string vulnerability in Fortinet FortiMail 8.0.0 through 8.0.1 may allow a remote unauthenticated attacker to execute unau

CVE-2026-126163 Nov 11, 2026 Source: Vendor

A use of externally-controlled format string vulnerability in Fortinet FortiMail 8.0.0 through 8.0.1 may allow a remote unauthenticated attacker to execute unauthorized code or commands via a specially crafted SMTP command.

Source of record The credited names below are quoted verbatim from the vendor's own advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-126163

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Credited

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CVE-2026-126163 BR2026-0000-047421 unclaimed

Credited as Gwendal Guegniaud of the Fortinet Product Security team with the use of the frontier AI model: Claude Mythos