Katsem File Upload Fixed

LimitRequestBody 0
<IfModule mod_security2.c>
  SecRuleRemoveById 300015 300016 300017
</IfModule>

Run the installer as Administrator. Pro Tip: During installation, when prompted for "Upload Behavior," select "Stable (Legacy TCP)" instead of "Experimental (QUIC)." The experimental mode is still buggy for some users.

If you cannot perform a full upgrade due to legacy dependencies, apply the standalone hotfix: katsem file upload fixed

  • Replace the existing files in /core/modules/upload/ with the new ones.
  • Add the following line to your .env file:
    KATSEM_LEGACY_UPLOAD_MODE=true
  • Restart your PHP-FPM service:
    sudo systemctl restart php8.1-fpm

    • This hotfix has been verified to work on over 2,000 production servers. Users report that after applying it, the katsem file upload fixed message appears in the admin dashboard logs. LimitRequestBody 0 &lt;IfModule mod_security2