CVE-2026-8844
Deferred Deferred - Pending Action
Stored XSS in Responsive Check WordPress Plugin

Publication date: 2026-05-27

Last updated on: 2026-05-27

Assigner: Wordfence

Description
The Responsive Check plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'rspcheck' shortcode in versions up to, and including, 0.0.3. This is due to insufficient input sanitization and output escaping on the 'url' (and 'button') shortcode attributes in the rspc_check_shortcode() function, which are echoed directly into iframe src attributes without esc_attr() or esc_url(). 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
2026-05-27
Last Modified
2026-05-27
Generated
2026-06-16
AI Q&A
2026-05-27
EPSS Evaluated
2026-06-15
NVD
CVE-2026-8844
EUVD
EUVD-2026-32088
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
wordfence responsive_check to 0.0.3 (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 Responsive Check plugin for WordPress has a Stored Cross-Site Scripting (XSS) vulnerability in versions up to and including 0.0.3. This occurs because the plugin does not properly sanitize or escape input provided to the 'rspcheck' shortcode, specifically the 'url' and 'button' attributes. These attributes are directly inserted into iframe src attributes without using proper escaping functions like esc_attr() or esc_url(). 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 web scripts into pages. These scripts execute in the context of users who visit the infected pages, potentially leading to theft of sensitive information, session hijacking, or other malicious actions. Because the attack is stored, the malicious code persists and affects all users who access the compromised content.

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