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CVE-2026-84393 is an improper certificate validation vulnerability in the Agentless ZTNA portal of Fortinet FortiOS 7.6.1 through 7.6.6 and FortiProxy 7.6.2 through 7.6.6. The portal does not properly validate a backend destination website certificate when its hostname does not match. An on-path attacker can present a forged or hostname-mismatched certificate and interfere with the TLS connection between the portal and the backend destination website.
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What an attacker gets, and what they’ve been doing with it.
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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.
13 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A network-reachable Fortinet FortiOS vulnerability with high impact to confidentiality, integrity, and availability according to the listed CVSS v3 vector. The content does not describe the underlying flaw type.
A network-accessible Fortinet FortiProxy vulnerability requiring high attack complexity and no privileges or user interaction, with high confidentiality, integrity, and availability impact.
A high-severity vulnerability in the FortiOS and FortiProxy Agentless ZTNA portal that could enable man-in-the-middle attacks.
An improper certificate host-mismatch validation vulnerability that may permit information disclosure in specified Fortinet FortiOS and FortiProxy versions. The attack vector is not provided in the content.
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.