CVE-2025-54476: Joomla! CMS vulnerable to XSS via the input filter

medium Affects joomla/filter. Feed 2026.10.29.4, updated 2026-10-29; published 2025-09-30; advisory modified 2025-10-01.

Joomla! CMS vulnerable to XSS via the input filter

Package: joomla/filter Composer
Affected versions: >=4.0.0 and <4.0.1 or >=3.0.0 and <3.0.5 or <2.0.6
Fixed in: 4.0.1, 3.0.5, 2.0.6
Severity: medium
Exploitation: not on CISA KEV · EPSS 0% (24.3th percentile)
Published: 2025-09-30
Source: osv.dev

References

CWE-79

NVD record joomla/filter advisories

Am I affected?

Find out in one command. phpwarden checks your composer.lock against this advisory and 20,000+ others, ranked by real-world exploitation (CISA KEV + EPSS). Free, offline, open data.

# PHP projects (recommended)
composer require --dev phpwarden/phpwarden
# then
vendor/bin/phpwarden deps composer.lock

# or, without Composer
pipx install phpwarden   &&   phpwarden deps composer.lock

Or keep it checked automatically: GitHub Action · pre-commit hook · GitLab CI · Laravel artisan command

Install docs How findings are ranked

Related advisories

CVE-2022-23800 medium Cross-site Scripting (XSS) within joomla/filter class same package: joomla/filter
CVE-2020-11023 KEV medium Potential XSS vulnerability in jQuery same weakness: CWE-79
CVE-2019-9978 KEV medium The social-warfare plugin before 3.5.3 for WordPress has stored XSS via the wp-admin/admin same weakness: CWE-79
CVE-2020-11022 medium Potential XSS vulnerability in jQuery same weakness: CWE-79
CVE-2022-3562 medium Cross-site Scripting in librenms/librenms same weakness: CWE-79
CVE-2022-4067 medium Cross-site Scripting in librenms/librenms same weakness: CWE-79