markjaquith vulnerabilities and threats

CVE-2026-66706 is a medium severity cross-site scripting (XSS) vulnerability in the Subscribe to Comments plugin by Mark Jaquith. It affects versions up to and including 2.3.1. The vulnerability involves improper neutralization of input during web page generation, which can lead to reflected or stored XSS attacks. The CVSS score is 5.9, indicating a moderate impact on confidentiality, integrity, and availability. No official patch or remediation guidance is currently available from the vendor. There are no known exploits in the wild at this time.

The Subscribe to Comments plugin for WordPress is vulnerable to Reflected Cross-Site Scripting due to the use of add_query_arg without appropriate escaping on the URL in all versions up to, and including, 2.3. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.