WordPress · Webmention · CVE-2026-0686
Name of the Vulnerable Software and Affected Versions
Webmention plugin for WordPress versions up to and including 5.6.2
Description
The Webmention plugin for WordPress is susceptible to Server-Side Request Forgery in versions up to and including 5.6.2. This issue resides within the `MF2::parse authorpage` function, accessible through the `Receiver::post` function. An unauthenticated attacker can leverage this to make web requests to arbitrary locations originating from the web application, potentially querying and modifying information from internal services.
Recommendations
Update the Webmention plugin to a version later than 5.6.2.