WordPress / ClassicPress plugin to enable SVG uploads for admins.

svg-upload-support.php

<?php
/**
 * Plugin Name: SVG Upload Support
 * Description: Allows SVG uploads for admins only.
 * Version: 1.0
 * Author: Ostap Brehin
 * Author URI: https://ostapbrehin.com
 */

add_filter('upload_mimes', function ($mimes) {
    if (current_user_can('manage_options')) {
        $mimes['svg'] = 'image/svg+xml';
    }
    return $mimes;
});

add_filter('wp_check_filetype_and_ext', function ($data, $file, $filename, $mimes) {
    if (!$data['type'] && current_user_can('manage_options') && preg_match('/\.svg$/i', $filename)) {
        $data['type'] = 'image/svg+xml';
        $data['ext']  = 'svg';
    }
    return $data;
}, 10, 4);