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CVE-2026-104286 is a path traversal vulnerability in the Fortinet FortiMail GUI, compounded by improper neutralization of NULL bytes or NULL characters (CWE-158). Affected FortiMail releases fail to adequately restrict attacker-controlled pathnames supplied in crafted HTTP or HTTPS requests. An unauthenticated remote attacker can exploit the flaw to write arbitrary files to the underlying FortiMail system.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
config system encryption ibe, set status disable, and end. Until a fixed release is installed, remove Internet access to the FortiMail management interface or limit management access to trusted private networks. Review relevant file, log, and network indicators for signs of compromise.Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
39 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical unauthenticated arbitrary-file-write vulnerability in the FortiMail management interface. It combines path traversal (CWE-22) and improper NULL-byte neutralization (CWE-158), allowing crafted HTTP or HTTPS requests to write arbitrary files on the underlying system and enabling unauthorized command or code execution.
A critical unauthenticated remote arbitrary-file-write vulnerability in Fortinet FortiMail, caused by path traversal and improper neutralization of NULL bytes. It can enable system compromise or loss of availability.
Critical unauthenticated path-traversal vulnerability in Fortinet FortiMail that permits arbitrary file writes to the underlying system through crafted HTTP or HTTPS requests. The listed CVSS v3.1 vector is AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.