GHSA-r9gv-qffm-xw6f Yeswiki Vulnerable to Unauthenticated Reflected Cross-site Scripting

• Packagist yeswiki/yeswiki: < 4.5.4 → fixed in 4.5.4

Summary Vulnerable Version: Yeswiki alert(1)` Details Reflected Cross-Site Scripting (XSS) attacks are a type of injection, in which malicious scripts are injected into otherwise benign and trusted websites. XSS attacks occur when an attacker uses a web application to send malicious code, generally in the form of a browser-side script, to a different end user. Flaws that allow these attacks to succeed are quite widespread and occur anywhere a web application uses input from a user within the output it generates without validating or encoding it. PoC 1. Visit the endpoint as mentioned below and see that an alert box pops up: URL with Payload: `https://yeswiki.net/?BazaR/bazariframe&id=2&template=%3cscript%3ealert(1)%3c%2fscript%3e` Impact An attacker can use a reflected cross-site scripting attack to steal cookies from an authenticated user by having them click on a malicious link. Stolen cookies allow the attacker to take over the user’s session. This vulnerability may also allow attackers to deface the website or embed malicious content.