CVE-2026-8883: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in helpstring Global Body Mass Index Calculator
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.
AI Analysis
Technical Summary
CVE-2026-8883 is a stored cross-site scripting vulnerability in the Global Body Mass Index Calculator WordPress plugin. The flaw exists because the plugin's GBMI_Calc_Widget::widget() function extracts shortcode attributes directly into local variables and outputs them unescaped into HTML style attributes and body context. This allows an authenticated attacker with contributor or higher privileges to inject arbitrary JavaScript code via crafted shortcode attributes, which executes when users access the compromised page.
Potential Impact
An attacker with contributor-level access or higher can inject persistent malicious scripts into pages using the vulnerable shortcode. These scripts execute in the browsers of users who visit the infected pages, potentially leading to session hijacking, defacement, or other client-side attacks. The vulnerability does not allow unauthenticated attackers to exploit it and does not impact availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict contributor-level access to trusted users only and consider disabling or removing the Global Body Mass Index Calculator plugin if it is not essential. Monitor for plugin updates from the vendor that address this vulnerability.
CVE-2026-8883: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in helpstring Global Body Mass Index Calculator
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.
CVSS v3.1
Score 6.4medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-8883 is a stored cross-site scripting vulnerability in the Global Body Mass Index Calculator WordPress plugin. The flaw exists because the plugin's GBMI_Calc_Widget::widget() function extracts shortcode attributes directly into local variables and outputs them unescaped into HTML style attributes and body context. This allows an authenticated attacker with contributor or higher privileges to inject arbitrary JavaScript code via crafted shortcode attributes, which executes when users access the compromised page.
Potential Impact
An attacker with contributor-level access or higher can inject persistent malicious scripts into pages using the vulnerable shortcode. These scripts execute in the browsers of users who visit the infected pages, potentially leading to session hijacking, defacement, or other client-side attacks. The vulnerability does not allow unauthenticated attackers to exploit it and does not impact availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict contributor-level access to trusted users only and consider disabling or removing the Global Body Mass Index Calculator plugin if it is not essential. Monitor for plugin updates from the vendor that address this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Wordfence
- Date Reserved
- 2026-05-18T20:33:50.259Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a279b3ce29bf47b5035a9fa
Added to database: 6/9/2026, 4:49:00 AM
Last enriched: 6/9/2026, 5:05:50 AM
Last updated: 6/9/2026, 1:13:06 PM
Views: 6
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