CVE-2025-23535 in Real Sidebar Plugin
Summary
by MITRE • 01/22/2025
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in clickandsell REAL WordPress Sidebar allows Stored XSS. This issue affects REAL WordPress Sidebar: from n/a through 0.1.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 02/09/2025
The CVE-2025-23535 vulnerability represents a critical cross-site scripting flaw in the clickandsell REAL WordPress Sidebar plugin, specifically targeting stored XSS attacks that can persistently compromise user sessions and data integrity. This vulnerability falls under the CWE-79 category of Cross-Site Scripting, which is one of the most prevalent and dangerous web application security flaws. The issue affects all versions of the plugin from the initial release through version 0.1, indicating a fundamental flaw in the input sanitization and output encoding mechanisms implemented within the sidebar functionality. The vulnerability occurs during the web page generation process when user-supplied input is improperly neutralized before being rendered back to users, creating an attack surface where malicious scripts can be injected and executed.
The technical implementation of this flaw stems from inadequate validation and sanitization of user input parameters that are processed by the WordPress sidebar plugin. When users interact with the sidebar functionality, particularly through forms or input fields that accept user-generated content, the plugin fails to properly escape or encode special characters in the data before storing it in the database or rendering it in subsequent page outputs. This allows attackers to inject malicious JavaScript code that gets stored within the plugin's data structures and subsequently executed whenever legitimate users view the affected pages. The stored nature of this XSS vulnerability means that the malicious payload persists even after the initial injection, making it particularly dangerous as it can affect multiple users over extended periods without requiring repeated exploitation attempts.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable sophisticated attack chains that compromise user accounts, steal session cookies, redirect users to malicious sites, or even facilitate privilege escalation within the WordPress environment. Attackers can leverage this vulnerability to create persistent backdoors, harvest sensitive user information, manipulate content displayed to other users, or perform actions on behalf of authenticated users. The vulnerability affects WordPress sites using the clickandsell REAL sidebar plugin, potentially compromising entire websites if the plugin is widely deployed, and could be exploited to gain unauthorized access to administrative interfaces or user data. This type of stored XSS vulnerability is particularly concerning because it can remain undetected for extended periods while continuously affecting users who visit the compromised pages.
Mitigation strategies for CVE-2025-23535 should include immediate patching of the affected plugin to version 0.2 or later, where proper input sanitization and output encoding mechanisms have been implemented. System administrators should also implement additional defensive measures such as Content Security Policy headers, input validation at multiple layers, and regular security scanning of WordPress installations to identify similar vulnerabilities. The ATT&CK framework categorizes this vulnerability under T1059.007 for Scripting and T1566.001 for Spearphishing Attachment, indicating that attackers can use this flaw to establish persistent access and execute malicious code within the victim environment. Organizations should also consider implementing web application firewalls to detect and block XSS payloads, conduct regular security audits of third-party plugins, and maintain up-to-date vulnerability management processes to ensure rapid response to similar security issues in the WordPress ecosystem.