Post-to-Post Links <= 4.2 - Authenticated (Administrator+) Stored Cross-Site Scripting
EntreBase Advisory: The Post-to-Post Links plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 4.2 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only impacts multi-site installations and installations where unfiltered_html has been disabled.
Read more about this vulnerability: https://www.wordfence.com/threat-intel/vulnerabilities/id/67fc59b6-7b6e-4dcb-b86a-c2236cb263f4?source=api-prod
