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CVE-2026-59835 is a high-severity improper resource exposure 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 is classified as CWE-668, Exposure of Resource to Wrong Sphere, and allows a remote, unauthenticated attacker to access the VNC server associated with virtual machines used by FortiSandbox to perform malware scanning. The issue stems from VNC resources for scanning VMs being exposed beyond the intended trust boundary and reachable through network requests. Successful exploitation can permit unauthorized viewing of, and potentially interaction with, sandbox analysis desktop sessions, weakening isolation around the malware-analysis environment.
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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 high-severity vulnerability in Fortinet products that could allow a remote unauthenticated attacker to access the VNC server of virtual machines performing scans via network requests.
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.