CVE-2026-8891

Description

The BitForm plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugins bitform shortcode in versions up to, and including, 1.1.0. This is due to insufficient input sanitization and output escaping on user-supplied shortcode attributes (width and height) in the Shortcode::shortcode() function, which are interpolated directly into the style attribute of an <iframe> element. 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.