CVE-2026-0686: Pfefferle Webmention

High severity, CVSS 7.2. EPSS: 0.3% chance of exploitation in the next 30 days.

The Webmention plugin for WordPress is vulnerable to Server-Side Request Forgery in all versions up to, and including, 5.6.2 in the 'MF2::parse_authorpage' function via the 'Receiver::post' function. This makes it possible for unauthenticated attackers to make web requests to arbitrary locations originating from the web application and can be used to query and modify information from internal services.

Affected products

• Pfefferle Webmention: up to and including 5.6.2

Published 2026-04-02. Last modified 2026-06-17.