Tittle:
WordPress Plugin Login Rebuilder < 2.8.1 - Admin+ Stored XSS


References:
CVE-2023-2223

Author:
Taurus Omar 

Description:
The plugin does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed (for example in multisite setup).

Affects Plugins:
Login Rebuilder - Fixed in version 2.8.1

Proof of Concept:

1. Go to Settings » Login rebuilder
 
2. In Login file keyword, add payload: "><iframe src="<svg onload=alert(4);>">
 
3. Save the changes to trigger XSS. 


Classification:
Type XSS 
OWASP top 10 A7: Cross-Site Scripting (XSS)
CWE-79

wpScan:
https://wpscan.com/vulnerability/7b356b82-5d03-4f70-b4ce-f1405304bb52