Joomla 6.0.3 and 5.4.3 address bugs across the CMS

For administrators, the updates resolve several backend and content-management problems. Changes include a fix for an ignored language variable in Multilingual, improved language-cache error handling, a correction for a broken articles table, and a fix for incorrect URLs in the “Content: New Article Submitted” email template. The release also prevents errors when a ListView lacks a filter form.

Developers will find updates affecting extension installation, forms and compatibility with newer PHP versions. The Adapter install routine now uses the current manifest, Cassiopeia font-size validation has been extended, and a PHP 8.5 null-access deprecation warning has been addressed. Updates to NPM and Composer development dependencies also resolve audit warnings and reported security vulnerabilities in the development toolchain.

There is also a known issue involving Firefox version 148, released on 24 February 2026, where the TinyMCE editor can flicker and load content indefinitely. The project provides an installable hotfix for affected users.

Sites running Joomla 5.4.x do not need to upgrade immediately: bugfix support continues until 13 October 2026, with security patches scheduled until 12 October 2027. Those planning to move to Joomla 6 should test on a copy of production first and verify extension compatibility.

Published by the Joomla Project.