CVE-2026-54867 in Responsive Slider Plugin
Summary
by MITRE • 10/13/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Griden Responsive Slider responsive-slider allows Stored XSS.This issue affects Responsive Slider: from n/a through 0.1.9.
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Analysis
by VulDB Data Team • 10/13/2026
The identified vulnerability represents a classic instance of Improper Neutralization of Input During Web Page Generation, commonly known as Cross-Site Scripting or XSS. Specifically, this flaw manifests as a Stored XSS within the Griden Responsive Slider plugin for WordPress, affecting versions ranging from n/a through 0.1.9. Unlike reflected XSS attacks where malicious scripts are executed via manipulated URLs, stored vulnerabilities persist on the target server because user-supplied input is saved in a database or other persistent storage mechanism without adequate sanitization. In this context, an attacker can inject malicious JavaScript code into fields that feed into the slider configuration or content display areas of the responsive-slider component. Once injected, this payload remains active and is served to every visitor who views the affected page, significantly amplifying the potential impact compared to transient attack vectors.
From a technical perspective, the root cause lies in the failure of the application to properly validate, filter, or encode user input before rendering it within HTML context. When the responsive-slider processes data submitted by administrators or potentially other users with write access, it fails to escape special characters such as angle brackets, quotes, and ampersands that are essential for breaking out of safe text contexts into executable script blocks. This allows an attacker to inject arbitrary JavaScript code that executes in the browser environment of any user viewing the compromised page. The persistence of this data means that even if the initial injection point is secured later, previously stored malicious payloads continue to execute until they are manually removed from the database or overwritten with safe content.
The operational impact of this vulnerability is severe due to its ability to compromise session integrity and facilitate broader attacks against site visitors. An attacker leveraging this Stored XSS can steal administrative cookies or authentication tokens through document.cookie access, leading to account takeover if the victim has elevated privileges such as administrator rights on the WordPress installation. Furthermore, the malicious script can perform actions on behalf of the user without their knowledge, including modifying page content, redirecting users to phishing sites designed to harvest credentials, or defacing the website appearance. In enterprise environments, this could serve as an initial access vector for more sophisticated attacks like keylogging or session hijacking, undermining trust in the web application and potentially violating data protection regulations due to unauthorized access to sensitive user information.
This vulnerability aligns with CWE-79, which categorizes improper neutralization of input during web page generation, highlighting the critical need for robust output encoding strategies. From a threat modeling perspective using the MITRE ATT&CK framework, this flaw facilitates techniques associated with Initial Access and Credential Access, specifically under categories like Valid Accounts if combined with phishing or social engineering to gain initial access, followed by Collection via browser-based credential harvesting. The persistence aspect also touches upon Persistence mechanisms where malicious scripts remain active across multiple user sessions until remediated.
To mitigate this vulnerability, immediate action is required for all systems running Griden Responsive Slider versions up to 0.1.9. Administrators should update the plugin to a patched version that implements strict input validation and output encoding practices consistent with OWASP guidelines. Input sanitization must ensure that only expected data types are accepted, while output encoding must convert special characters into their HTML entity equivalents before rendering in the browser context. Additionally, implementing Content Security Policy headers can provide an additional layer of defense by restricting the sources from which scripts can be loaded and executed, thereby mitigating the impact even if a script injection occurs. Regular security audits and code reviews focusing on data flow between user input and database storage are essential to prevent similar flaws in future development cycles.