Link Library vulnerabilities

The Link Library plugin for WordPress is vulnerable to arbitrary file deletion due to insufficient file path validation in the ll_delete_link_fields function in all versions up to, and including, 7.9.4. This makes it possible for unauthenticated attackers to delete arbitrary files on the server, which can easily lead to remote code execution when the right file is deleted (such as wp-config.php). Exploitation requires the administrator to have enabled the 'Delete local file on link deletion' plugin option (disabled by default) and to subsequently permanently delete the attacker-submitted link, which is a routine moderation action.

The 'Link Library' WordPress plugin before version 7.9.3 does not properly sanitize and escape a user-supplied value before using it in a SQL query, allowing unauthenticated users to perform SQL injection attacks.

The Link Library WordPress plugin before version 7.9.4 does not sanitise and escape a parameter before reflecting it back in a response, allowing unauthenticated attackers to perform Reflected Cross-Site Scripting attacks against users who can be tricked into performing an action.

In Link Library versions <= 7.8.8, there is a vulnerability allowing arbitrary file deletion by users with appropriate permissions.