Reflected XSS in afr.php

Summary

Security advisory: REVIVE-SA-2026-001

Description

HackerOne community member Huynh Pham Thanh Luc (nigh7c0r3) has reported a reflected XSS vulnerability in the afr.php delivery script of Revive Adserver. An attacker can craft a specific URL that includes an HTML payload in a parameter. If a logged in administrator visits the URL, the HTML is sent to the browser and malicious scripts would be executed.

Details

The target GET parameter sent to the afr.php script was used in the output without proper sanitisation, allowing an attacker to craft specific URLs and have payloads output in the HTML, JS, and/or CSS context. Successful exploitation requires an attacker to trick a logged in user into visiting the crafted URL. What the attacker can do depends on various factors, such as the configuration file being locked and/or if the admin domain is different from the delivery domain.