CVE-2026-86790
Received Received - Intake

Stored XSS in WP Highlight Box WordPress Plugin

Publication date: 2026-09-12

Last updated on: 2026-09-12

Assigner: WPScan

Description
The WP Highlight Box WordPress plugin through 1.0 does not escape some shortcode attributes before outputting them in a page where the shortcode is embedded, which could allow users with the contributor role and above to perform Stored Cross-Site Scripting attacks.

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Meta Information

Published
2026-09-12
Last Modified
2026-09-12
Generated
2026-09-12
AI Q&A
2026-09-12
EPSS Evaluated
N/A
NVD
CVE-2026-86790
EUVD
EUVD-2026-76797

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
wp_highlight_box wp_highlight_box to 1.0 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability is a Stored Cross-Site Scripting (XSS) flaw in the WP Highlight Box WordPress plugin version 1.0 or below. It occurs because the plugin does not properly escape shortcode attributes before displaying them on pages where the shortcode is embedded. This allows users with contributor roles or higher to inject malicious scripts.

Detection Guidance

To detect this vulnerability, inspect WordPress sites using the WP Highlight Box plugin version 1.0 or below. Check for suspicious scripts in pages where the plugin's shortcode is embedded. Review contributor-level user roles for unauthorized script injections.

Impact Analysis

An attacker could exploit this to inject and execute malicious scripts in the context of a user's browser session. This could lead to theft of session cookies, account takeover, or defacement of the website. Users with contributor roles or above are the primary risk group.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, which may violate GDPR or HIPAA requirements for data protection and security. Organizations using the affected plugin may face compliance risks if exploited.

Mitigation Strategies

Immediately update the WP Highlight Box plugin to the latest version if available. If no update exists, consider disabling or removing the plugin. Restrict contributor-level user roles to minimize attack surface. Monitor pages for unexpected script content.

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