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Fact-check summary

CISA added CVE-2026-104286 (Fortinet FortiMail path traversal) to its KEV catalog on October 1, 2026, per the official catalog entry.

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Home/Tech/CISA adds Fortinet FortiMail path traversal flaw to KEV catalog
VERIFIEDBy Xavier Rivera· ·1 min read

CISA adds Fortinet FortiMail path traversal flaw to KEV catalog

CISA added CVE-2026-104286 in Fortinet FortiMail to its Known Exploited Vulnerabilities catalog on October 1, confirming active exploitation. Mitigations must be applied by October 4 or discontinue use where fixes are unavailable.

Source:CISA KEV
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CISA adds Fortinet FortiMail path traversal flaw to KEV catalog
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CISA added CVE-2026-104286 to its Known Exploited Vulnerabilities catalog on October 1, 2026, confirming active exploitation of a Fortinet FortiMail vulnerability.
An unauthenticated attacker can write arbitrary files on the underlying system through crafted HTTP or HTTPS requests.
CISA lists the flaw as actively exploited. The entry describes a path traversal vulnerability combined with improper neutralization of NULL byte or NULL character in FortiMail. An unauthenticated attacker can write arbitrary files on the underlying system through crafted HTTP or HTTPS requests.
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Due date is October 4. CISA requires immediate application of mitigations according to vendor instructions. Stakeholders must also follow BOD 26-04 guidance on prioritizing security updates based on risk and the associated forensics triage requirements.
If mitigations are unavailable, discontinuation of the product is required.
Cloud and exposed assets receive specific instructions. The directive states that applicable BOD 26-04 guidance must be followed for cloud services. If mitigations are unavailable, discontinuation of the product is required. Each asset's internet exposure must be evaluated for compliance.
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Vendor advisory and catalog details are available. The entry points to Fortinet's PSIRT notice at fortiguard.fortinet.com/psirt/FG-IR-26-175 and the NVD detail page for CVE-2026-104286.
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