helpstring Global Body Mass Index Calculator Plugin up to 1.2 on WordPress Shortcode GBMI_Calc_Widget::widget args cross site scripting

Summaryinfo

A vulnerability categorized as problematic has been discovered in helpstring Global Body Mass Index Calculator Plugin up to 1.2 on WordPress. Impacted is the function GBMI_Calc_Widget::widget of the component Shortcode Handler. Such manipulation of the argument args leads to cross site scripting. This vulnerability is referenced as CVE-2026-8883. It is possible to launch the attack remotely. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in helpstring Global Body Mass Index Calculator Plugin up to 1.2 on WordPress. It has been rated as problematic. Affected by this issue is the function GBMI_Calc_Widget::widget of the component Shortcode Handler. The manipulation of the argument args with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. CVE summarizes:

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.

The weakness was published by Muhammad Yudha. The advisory is shared for download at wordfence.com. This vulnerability is handled as CVE-2026-8883 since 05/18/2026. The exploitation is known to be easy. The attack may be launched remotely. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.007.

Upgrading to version 1.2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-35299). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• WordPress Plugin

Vendor

• helpstring

Name

• Global Body Mass Index Calculator Plugin

Version

• 1.0
• 1.1
• 1.2

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CPE 2.2info

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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