EUVD-2026-32088
GHSA-ww88-w7jc-gf24
Severity by source
AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Stored Cross-Site Scripting in the Responsive Check WordPress plugin (versions ≤ 0.0.3) allows authenticated attackers holding contributor-level access or above to inject persistent malicious scripts via the 'url' and 'button' attributes of the [rspcheck] shortcode. The payload executes in the browser of any user who visits an affected page, with a CVSS scope-change designation (S:C) reflecting cross-user impact. No public exploit has been identified and the EPSS score of 0.03% (9th percentile) places real-world exploitation probability firmly at the low end, though sites with open contributor registration remain meaningfully exposed.
Technical ContextAI
The Responsive Check plugin (WordPress plugin slug: responsive-checker-real-time) provides an [rspcheck] shortcode to embed an iframe-based viewport-width checker widget in posts and pages. The vulnerability resides in the rspc_check_shortcode() function within responsive-check.php (lines ~14, 25, and 54 per WordPress trac references), where the 'url' and 'button' shortcode attributes are interpolated directly into iframe src attributes and HTML output without applying WordPress's esc_url() or esc_attr() sanitization primitives. CWE-79 (Improper Neutralization of Input During Web Page Generation - XSS) classifies the root cause: attacker-controlled string data is stored in post content and later rendered into page HTML without encoding, creating a persistent injection point. Because WordPress grants contributor-level accounts the ability to insert arbitrary shortcodes into posts by default, this represents a low-barrier persistent write path into rendered page content.
RemediationAI
No patched version number is specified in any available reference - the WordPress trac links point to source code inspection rather than a changelog entry, and the Wordfence advisory does not confirm a fixed release version, so a vendor-released patch cannot be independently confirmed at time of analysis. Administrators should immediately check the WordPress plugin repository for an updated release of responsive-checker-real-time and upgrade if one has been published. If no update is available, the most effective and lowest-risk compensating control is to deactivate and uninstall the Responsive Check plugin entirely, which eliminates the attack surface without operational side effects beyond losing the iframe responsive-checker widget. If the plugin must remain active, restrict contributor-level and above post/page editing access exclusively to trusted, verified accounts and disable open user registration until a patch is confirmed. Administrators should audit existing post content for [rspcheck] shortcodes containing unexpected or obfuscated 'url' or 'button' attribute values as indicators of prior compromise. Monitor the Wordfence advisory at https://www.wordfence.com/threat-intel/vulnerabilities/id/d1d571e3-cf6d-4e9b-a3d7-e7e19497b5a9 for patch availability updates.
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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