What the vulnerability does
01Description
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.
Explanation of Vulnerability in Simple Terms
02Summary
Responsive Thumbnail Slider versions before 1.1.53 contain a cross-site scripting (XSS) vulnerability. An attacker can inject malicious scripts that execute in a visitor's browser when they view a page containing the slider. The vulnerability requires user interaction and can affect other parts of the site or steal session data. Update to version 1.1.53 or later to fix this issue.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts that run in visitors' browsers and steal session data or perform actions on their behalf.
Potential impact on your site
04Site Impact
Visitors' browsers can be compromised; attackers may steal login credentials, session tokens, or perform unauthorized actions.
Conditions required to exploit
05Prerequisites
No authentication required. Victim must visit a page containing the vulnerable slider component.
Key dates
06Disclosure timeline
August 1, 2026
CVE published
