CVE-2025-53579

Vulnerability

Overview

The Captcha.eu plugin for WordPress versions prior to 1.0.61 contains a reflected cross-site scripting (XSS) vulnerability due to improper neutralization of user input during web page generation [1]. This flaw allows an attacker to inject arbitrary HTML or JavaScript into a page, which is then executed in the context of the victim's browser.

Exploitation

Details

Exploitation requires user interaction, such as clicking a malicious link or visiting a crafted page [1]. No authentication is needed to initiate the attack, but a privileged user (e.g., admin) must perform the action for successful execution. The attack can be launched remotely without special network access.

Impact

Successful exploitation enables an attacker to inject malicious scripts, including redirects, advertisements, or other HTML payloads, which execute when other users visit the affected site [1]. This can lead to session hijacking, defacement, or distribution of malware.

Mitigation

The vulnerability is patched in version 1.0.61. Users are strongly advised to update immediately [1]. Workarounds include using a Web Application Firewall (WAF) or applying a virtual patch from security providers like Patchstack [1]. The vulnerability is considered moderately dangerous and may be used in mass-exploit campaigns.