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CVE-2026-25108 is an operating system command injection vulnerability in Soliton Systems K.K. FileZen. The issue is reachable after authentication: a logged-in user can send a specially crafted HTTP request to a specific post-logon field/function and cause arbitrary OS commands to be executed by the underlying system. The vulnerable condition is present when the FileZen Antivirus Check Option (described in some reporting as the virus check feature, BitDefender-based) is enabled. Reported affected versions are FileZen V4.2.1 through V4.2.8 and V5.0.0 through V5.0.10. Soliton Systems and JPCERT/CC have stated that exploitation has been confirmed in the wild.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
77 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An OS command injection vulnerability in Soliton Systems’ FileZen secure file transfer solution that is confirmed to be actively exploited and has been added to CISA’s KEV catalog.
An authenticated OS command injection vulnerability in Soliton Systems K.K. FileZen that allows arbitrary command execution via crafted HTTP requests when the virus check feature is enabled.
A critical OS command injection vulnerability in Soliton FileZen that is actively exploited and can allow authenticated attackers (valid login) to execute arbitrary OS commands via crafted HTTP requests to the web interface.
A critical OS command injection vulnerability in Soliton Systems FileZen (when Antivirus Check Option is enabled) that is actively exploited and can allow authenticated attackers to execute arbitrary OS commands via crafted HTTP requests to the web interface.
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.