CVE-2026-4011
Received Received - Intake
Stored XSS in Power Charts Lite WordPress Plugin via Shortcode

Publication date: 2026-04-15

Last updated on: 2026-04-15

Assigner: Wordfence

Description
The Power Charts Lite plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'id' parameter of the [pc] shortcode in all versions up to, and including, 0.1.0. This is due to insufficient input sanitization and output escaping on the 'id' shortcode attribute. Specifically, in the pc_shortcode() function, the 'id' attribute is extracted from user-supplied shortcode attributes and directly concatenated into an HTML div element's class attribute without any escaping or sanitization at line 62. The resulting HTML is then passed through html_entity_decode() before being returned, further undermining any potential safety. 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.
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Meta Information
Published
2026-04-15
Last Modified
2026-04-15
Generated
2026-06-16
AI Q&A
2026-04-15
EPSS Evaluated
2026-06-15
NVD
CVE-2026-4011
EUVD
EUVD-2026-22869
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
power_charts_lite power_charts_lite to 0.1.0 (inc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
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.
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Executive Summary

The Power Charts Lite plugin for WordPress has a Stored Cross-Site Scripting (XSS) vulnerability in the 'id' parameter of its [pc] shortcode in all versions up to 0.1.0. This happens because the plugin does not properly sanitize or escape the 'id' attribute before inserting it into an HTML div element's class attribute. Specifically, the 'id' value is taken directly from user input and concatenated into HTML without escaping, and then passed through html_entity_decode(), which further reduces safety. As a result, authenticated users with Contributor-level access or higher can inject malicious scripts that execute whenever someone views the affected page.

Impact Analysis

This vulnerability allows attackers with Contributor-level access or above to inject arbitrary JavaScript into pages via the 'id' shortcode attribute. When other users visit these pages, the injected scripts execute in their browsers, potentially leading to session hijacking, defacement, or unauthorized actions performed on behalf of the user. This can compromise the security and integrity of the website and its users.

Detection Guidance

Detection of this vulnerability involves identifying the presence of the Power Charts Lite plugin version 0.1.0 or earlier on WordPress installations and checking for usage of the [pc] shortcode with the 'id' parameter.

Since the vulnerability is a Stored Cross-Site Scripting via the 'id' parameter in the shortcode, you can look for pages or posts containing the [pc] shortcode with suspicious or unexpected values in the 'id' attribute.

There are no specific commands provided in the available resources, but general approaches include:

  • Searching the WordPress database for posts or pages containing the [pc] shortcode with the 'id' attribute, e.g., using SQL queries to find shortcode usage.
  • Using web vulnerability scanners or security plugins that can detect stored XSS vulnerabilities in WordPress plugins.
  • Manually reviewing content or source code for injected scripts or unusual HTML in pages using the plugin.
Mitigation Strategies

Immediate mitigation steps include:

  • Update the Power Charts Lite plugin to a version later than 0.1.0 where this vulnerability is fixed, if available.
  • Restrict Contributor-level and higher user permissions to trusted users only, as the vulnerability requires authenticated users with at least Contributor access.
  • Temporarily disable or remove the Power Charts Lite plugin if an update is not available.
  • Review and sanitize any existing content that uses the [pc] shortcode with the 'id' parameter to remove potentially malicious scripts.
  • Implement additional security measures such as Web Application Firewalls (WAF) to block malicious payloads.
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