Smash Balloon Instagram Feed < 6.9.1 - Contributor+ Stored XSS via `data-plugin` Attribute

Description

The plugin is vulnerable to Stored Cross-Site Scripting via the `data-plugin` attribute due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.