What the vulnerability does
01Description
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.
Explanation of Vulnerability in Simple Terms
02Summary
BitForm versions up to 1.1.0 contain a cross-site scripting (XSS) vulnerability that allows authenticated users to inject malicious scripts. The vulnerability has a changed scope, meaning injected code can affect other users and site functionality. An attacker with low-level WordPress access can craft malicious input that executes in other users' browsers without requiring additional user interaction.
What an attacker can do
03Attacker Capabilities
Inject malicious JavaScript that runs in other users' browsers and affects site functionality.
Potential impact on your site
04Site Impact
Authenticated attackers can steal admin credentials, modify site content, or compromise other user accounts.
Conditions required to exploit
05Prerequisites
Attacker must have a low-level WordPress user account (e.g., subscriber or contributor role).
Key dates
06Disclosure timeline
May 27, 2026
CVE published
May 27, 2026
Record updated
