Safe SVG is the best way to Allow SVG Uploads in WordPress!
It gives you the ability to allow SVG uploads whilst making sure that they’re sanitized to stop SVG/XML vulnerabilities affecting your site. It also gives you the ability to preview your uploaded SVGs in the media library in all views.
Current Features
- Sanitised SVGs – Don’t open up security holes in your WordPress site by allowing uploads of unsanitised files.
- SVGO Optimisation – Runs your SVGs through the SVGO tool on upload to save you space. This feature is disabled by default but can be enabled by adding the following code:
add_filter( 'safe_svg_optimizer_enabled', '__return_true' ); - View SVGs in the Media Library – Gone are the days of guessing which SVG is the correct one, we’ll enable SVG previews in the WordPress media library.
- Choose Who Can Upload – Restrict SVG uploads to certain users on your WordPress site or allow anyone to upload.
Initially a proof of concept for #24251.
SVG Sanitization is done through the following library: https://github.com/darylldoyle/svg-sanitizer.
SVG Optimization is done through the following library: https://github.com/svg/svgo.
Technical: Upload Path Security
WordPress’s _wp_handle_upload( $file, $action ) function allows any $action value, which determines the filter hook name: {$action}_prefilter. Safe SVG hooks common actions like wp_handle_upload and wp_handle_sideload, but cannot hook arbitrary custom actions defined by third-party code. Since upload actions are unbounded and MIME allowances are global, we cannot guarantee sanitization coverage across all possible upload paths.