CVE-2026-8891: Bitform – Data Management Solution For WordPress

Medium severity, CVSS 6.4. EPSS: 0.3% chance of exploitation in the next 30 days.

The BitForm plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's '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.

Affected products

• Bitform Bitform – Data Management Solution For WordPress: up to and including 1.1.0

Published 2026-05-27. Last modified 2026-06-17.