Improper limitation of a pathname to a restricted directory
CVSSv3 Score: 9.8 An Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') and Improper Neutralization of NULL Byte or NULL Character vulnerability may allow an unauthenticated attacker to write arbitrary files on the underlying system via crafted HTTP or HTTPS requests.This has been reported to be exploited in the wild, customers are urged to apply the workaround below. Revised on 2026-10-01 00:00:00
Platform
FortiGate / FortiOS
CVSS Score
9.8/10
Advisory
FG-IR-26-175
Published
01 October 2026
Views
5
Primary source: Review the official advisory at fortiguard.fortinet.com
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Summary
CVSSv3 Score: 9.8 An Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') and Improper Neutralization of NULL Byte or NULL Character vulnerability may allow an unauthenticated attacker to write arbitrary files on the underlying system via crafted HTTP or HTTPS requests.This has been reported to be exploited in the wild, customers are urged to apply the workaround below. Revised on 2026-10-01 00:00:00
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.
Fortinet FortiOS, FortiSwitchManager, and FortiSASE contain a heap-based buffer overflow vulnerability that allows an attacker to execute unauthorized code or commands via specially crafted packets.
CVSSv3 Score: 7.3 An improper certificate validation vulnerability in FortiOS and FortiProxy Agentless ZTNA portal may allow a remote and unauthenticated attacker to perform a Man-in-the-Middle attack on the communication channel between the ZTNA portal and the backend destination website. Revised on 2026-09-08 00:00:00