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The Broken Link Checker plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Comment Author URL / Link Log in all versions up to, and including, 2.4.13 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Exploitation requires an administrator to perform the plugin's standard dismiss-and-recheck workflow on a link submitted by the attacker via the WordPress comment author URL field, after which the attacker's HTTP server issues a redirect to a URL containing an HTML/JavaScript payload that is stored verbatim in the link log.
The Broken Link Checker plugin for WordPress is vulnerable to unauthorized data access due to a missing capability check on the ajaxfullstatus and ajaxdashboardstatus functions in all versions up to, and including, 2.4.4. This makes it possible for authenticated attackers, with Subscriber-level access and above, to view the plugin's status.
The Broken Link Checker WordPress plugin before 2.4.2 does not validate a the link URLs before making a request to them, which could allow admin users to perform SSRF attack, for example on a multisite installation.
The Broken Link Checker | Finder plugin for WordPress is vulnerable to Blind Server-Side Request Forgery in all versions up to, and including, 2.5.0 via the 'moblcchecklink' function. This makes it possible for authenticated attackers, with Author-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.
The Broken Link Checker plugin for WordPress is vulnerable to Reflected Cross-Site Scripting due to the use of addqueryarg in /app/admin-notices/features/class-view.php without appropriate escaping on the URL in all versions up to, and including, 2.4.0. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.