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Documentation: Admin Customizer plugin

Changelog

Admin Customizer - v1.1.0 5 6

7 October 2026

  • Security: the Custom CSS setting is checked before it is placed in the page, so it can no longer close the style block and run script on the administrator pages that show it. Changing that setting needs access to the options, which is not necessarily a Super User
  • Fix: a long API key was cut off while you pasted it. Joomla limits a hidden key field to 99 characters unless the extension says otherwise, so the browser silently dropped everything past the 99th character and the service answered with an authorisation error. The key fields now allow 255 characters. Enter your key again if it was longer than that
  • Addition: Joomill scheduled promotion
  • Addition: License status notice
  • Language: new strings in all 6 languages; the Spanish ones are a provisional translation awaiting review
  • Change: compatible with Joomla 6.2

Admin Customizer - v1.0.2 5 6

1 September 2026

  • Security: downloading your settings now requires the same confirmation and Super User rights as uploading them, so a link alone can no longer pull your configuration out of the site
  • Security: locally cached Google Fonts are only stored when they are real font files, and the font folder is closed off for anything that could be executed
  • Security: settings from an uploaded backup file are cleaned more strictly before they are used in the backend styling
  • Security: text you enter for the login screen is now placed on the page exactly as typed, without special characters being interpreted
  • Security: the helper plugin for update logging is only installed when the update server supplies a valid checksum for it, and only from the Joomill update server

Admin Customizer - v1.0.1 5 6

1 August 2026

  • Fix: hiding the sitename and the "Joomla Administrator Login" line in the login sidebar had no effect on Joomla 6.1 and newer. Atum changed that markup from `<h1 />`/`<h2 />` to `<p class="h1" />`/`<p class="h2" />`, so the rules now target both. The sidebar text color applies to both markups as well
  • Change: full code style pass against the Joomla CMS phpcs ruleset (PSR-12): phpcbf auto-fixes for indentation, line endings, brace placement and whitespace, plus phpcs annotations for deliberate exceptions (`_JEXEC` guards, legacy global class names, legacy API naming). Code style only, no functional changes
  • Language: added Dutch (nl-NL), German (de-DE), French (fr-FR), Spanish (es-ES) and Italian (it-IT) translations

Admin Customizer - v1.0.0 5 6

19 July 2026

  • Addition: Initial Release