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CVE-2026-40456 is an OS command injection vulnerability in LMS (LAN Management System) affecting versions before commit 9fcb4de. The flaw is caused by an IP address parameter being passed to the PHP exec() function without proper validation or sanitization. Because user-controlled input reaches an operating system command execution sink, an attacker can inject shell metacharacters or additional command content and cause arbitrary commands to be executed by the underlying OS in the security context of the LMS application.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
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.
An OS command injection vulnerability in LMS (LAN Management System) before commit 9fcb4de caused by insufficient validation of an IP address parameter passed to exec(), potentially allowing arbitrary OS command execution.
An OS command injection vulnerability in LMS (LAN Management System) affecting versions before commit 9fcb4de, caused by improper validation of an IP address parameter passed to exec().
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.