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CVE-2026-59835 is a high-severity exposure of resource to wrong sphere vulnerability in Fortinet FortiSandbox. Affected versions include FortiSandbox 5.0.0 through 5.0.2 and 4.4.3 through 4.4.8. The flaw exposes the VNC service associated with virtual machines used by FortiSandbox during malware scanning, allowing an unauthenticated attacker to access those VM desktop sessions over the network by sending network requests. The issue represents an access-control failure in which an internal sandbox resource is reachable from an unintended network sphere. Successful exploitation can allow observation of, and potentially interaction with, malware-analysis virtual machines, weakening the isolation boundary of the sandbox environment.
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What an attacker gets, and what they’ve been doing with it.
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No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A high-severity FortiSandbox vulnerability caused by improper exposure of internal VNC services for sandbox virtual machines, allowing unauthenticated network attackers to access malware analysis desktop sessions.
An unauthenticated exposure vulnerability in FortiSandbox where VNC is exposed on all network interfaces, potentially allowing direct console access to the appliance.
A high-severity FortiSandbox vulnerability that allows unauthenticated attackers to send crafted network requests and access the VNC server associated with malware-scanning virtual machines, leading to potential information disclosure and undermining sandbox isolation.
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.