Happyforms < 1.26.1 - Authenticated (Author+) Stored Cross-Site Scripting

Description

The Happyforms plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 1.26.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.