CVE-2026-8883 Cross-site scripting in Global Body Mass Index Calculator
Authenticated attackers can inject arbitrary scripts via shortcode attributes in the Global Body Mass Index Calculator plugin, leading to stored XSS.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-8883?
CVE-2026-8883 is a medium-severity cross-site scripting vulnerability in helpstring Global Body Mass Index Calculator, published on 9 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-8883?
How do I fix CVE-2026-8883?
No fix has been published for CVE-2026-8883 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-8883 being exploited?
There is no known exploitation of CVE-2026-8883 in the wild and no public exploit code.
Sources
Also known as GHSA-3xrw-mxp7-2r3j.