An Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') [CWE-22] and Improper Neutralization of NULL Byte or NULL Character [CWE-158] 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.
Disable the IBE feature support using the following CLI command:
Alternatively: Disable access to the FortiMail management interface from the internet or limit the access only from trusted private network
Indicators of Compromise (IoC): Files:
2026-10-01: Initial publication
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