CVE-2026-8883: Helpstring Global Body Mass Index Calculator

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

The Global Body Mass Index Calculator plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'gbmicalc' shortcode in versions up to, and including, 1.2. This is due to insufficient input sanitization and output escaping on user-supplied shortcode attributes in the GBMI_Calc_Widget::widget() function. Shortcode attributes are extracted directly into local variables via @extract($args) and then echoed unescaped into an HTML style attribute (height/width) and HTML body context (title), allowing attribute-breakout payloads. 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

• Helpstring Global Body Mass Index Calculator: up to and including 1.2

Published 2026-06-09. Last modified 2026-07-23.