Description

If an attacker attempt to login with an XSS payload inside the username, the login attempt will be logged on the admin dashboard. Then, if an admin visits the login logs page, it will execute the XSS.

Proof of Concept

Login with XSS inside username

Admin visits logs

Impact

XSS can cause a variety of problems for the end user that range in severity from an annoyance to complete account compromise. The most severe XSS attacks involve disclosure of the user’s session cookie, allowing an attacker to hijack the user’s session and take over the account. Other damaging attacks include the disclosure of end user files, installation of Trojan horse programs, redirecting the user to some other page or site, or modifying presentation of content. An XSS vulnerability allowing an attacker to modify a press release or news item could affect a company’s stock price or lessen consumer confidence. An XSS vulnerability on a pharmaceutical site could allow an attacker to modify dosage information resulting in an overdose. Source OWASP - Cross Site Scripting (XSS).