Issues and Series for Newspapers, Magazines, Publishers, Writers < 2.17.1 - Authenticated (Administrator+) Stored Cross-Site Scripting

Description

The Issues and Series for Newspapers, Magazines, Publishers, Writers plugin for WordPress is vulnerable to Stored Cross-Site Scripting in all versions up to, and including, 2.17.0. This is 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 affects multi-site installations and installations where unfiltered_html has been disabled.