CVE-2026-0688: Pfefferle Webmention

Medium severity, CVSS 6.4. EPSS: 0.2% 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 via the 'Tools::read' function. This makes it possible for authenticated attackers, with Subscriber-level access and above, 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.