Link Library WordPress plugin vulnerabilities

The Link Library WordPress plugin before 7.9.6 does not validate the destination of a user-supplied URL before falling back to an unprotected fetch when its safe request is rejected. This allows unauthenticated visitors to make the site issue requests to hosts on its internal network and to learn from the response whether an internal service answered.

The Link Library WordPress plugin before 7.9.6 does not sanitize a user-supplied destination folder before writing a generated image to disk. This allows users with the Contributor role and above to create directories and write or overwrite image files anywhere the web server can write, including outside the site's document root.

The Link Library WordPress plugin before 7.9.6 does not properly escape some parameters before outputting them in the addresses of links it generates on its front-end directory pages. This leads to Reflected Cross-Site Scripting (XSS) which could be used against any visitor, including logged-in administrators.