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CVE-2026-39812 is a stored cross-site scripting vulnerability in Fortinet FortiSandbox and FortiSandbox PaaS. The issue is caused by improper neutralization of input during web page generation, allowing attacker-controlled content to be stored by the application and later rendered in a victim’s browser without adequate sanitization or output encoding. Reported affected versions include FortiSandbox 5.0.0 through 5.0.5, FortiSandbox 4.4.0 through 4.4.8, all FortiSandbox 4.2 versions, FortiSandbox PaaS 5.0.0 through 5.0.5, FortiSandbox PaaS 4.4.0 through 4.4.8, and all FortiSandbox PaaS 4.2 versions; other reporting narrows confirmed affected versions to 5.0.1 through 5.0.5 for FortiSandbox and FortiSandbox PaaS. The vulnerable parameter or function is not specified in the available information.
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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.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical out-of-bounds write vulnerability in the FortiSandbox administrative interface.
A medium-severity vulnerability affecting FortiSandbox, FortiSandbox Cloud, or FortiSandbox PaaS that allows cross-site scripting attacks.
A stored XSS vulnerability affecting FortiSandbox and FortiSandbox PaaS.
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.