CVE-2026-18344
Received Received - Intake

Reflected Cross-Site Scripting in Wp Responsive Thumbnail Slider Plugin

Publication date: 2026-08-01

Last updated on: 2026-08-01

Assigner: Wordfence

Description
The Wp Responsive Thumbnail Slider plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'id' parameter in versions up to, and excluding, 1.1.53. This is due to insufficient input sanitization and output escaping in the responsive_thumbnail_image_management() function, which echoes $_GET['id'] directly into a double-quoted HTML attribute with no esc_attr() call. The only guard is a loose PHP numeric comparison ($_GET['id']>0) that a string beginning with a numeric prefix trivially satisfies, and the addslashes() applied by wp_magic_quotes() is inert in HTML-attribute context because backslash is not an HTML escape character. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a specially crafted link.

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Meta Information

Published
2026-08-01
Last Modified
2026-08-01
Generated
2026-08-01
AI Q&A
2026-08-01
EPSS Evaluated
N/A
NVD
CVE-2026-18344
EUVD
EUVD-2026-51794

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
wp_responsive_thumbnail_slider plugin to 1.1.53 (exc)

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

This vulnerability is a Reflected Cross-Site Scripting (XSS) issue in the Wp Responsive Thumbnail Slider WordPress plugin. It occurs due to insufficient input sanitization and output escaping in the 'id' parameter. Attackers can inject malicious scripts via a crafted link, which executes when a user clicks it.

Detection Guidance

Check for the presence of the Wp Responsive Thumbnail Slider plugin versions up to 1.1.53. Inspect server logs for unusual requests containing the 'id' parameter with script-like input. Use WordPress security plugins to scan for vulnerable components.

Impact Analysis

An attacker could trick you into clicking a malicious link, leading to unauthorized script execution in your browser. This may result in stolen session cookies, account takeovers, or defacement of web pages you visit. The impact is limited to actions performed by the victim after clicking the link.

Compliance Impact

This XSS vulnerability could lead to unauthorized access to user data, violating GDPR's data protection principles and HIPAA's security requirements for protected health information. Organizations may face compliance breaches if user data is compromised through such attacks.

Mitigation Strategies

Update the Wp Responsive Thumbnail Slider plugin to version 1.1.53 or later. If an update is unavailable, consider disabling or removing the plugin immediately. Implement input validation and output escaping in web applications to prevent XSS attacks.

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