CVE-2024-29925 in Post Grid, Slider & Carousel Ultimate Plugin
Summary
by MITRE • 03/27/2024
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in wpWax Post Grid, Slider & Carousel Ultimate allows Stored XSS.This issue affects Post Grid, Slider & Carousel Ultimate: from n/a through 1.6.6.
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Analysis
by VulDB Data Team • 04/12/2025
The vulnerability identified as CVE-2024-29925 represents a critical cross-site scripting weakness within the wpWax Post Grid, Slider & Carousel Ultimate WordPress plugin. This stored XSS vulnerability occurs during the web page generation process when user input is inadequately sanitized or escaped before being rendered in HTML output. The flaw specifically manifests in the plugin's handling of data that gets stored and subsequently displayed on web pages, creating a persistent vector for malicious script execution. The vulnerability affects all versions of the plugin from the initial release through version 1.6.6, indicating a long-standing issue that has not been properly addressed. This type of vulnerability falls under CWE-79 which categorizes improper neutralization of input during web page generation as a primary weakness leading to XSS attacks.
The technical exploitation of this vulnerability occurs when an attacker can inject malicious JavaScript code through input fields that are then stored within the plugin's database or configuration. When other users view pages generated by the plugin, their browsers execute the stored malicious scripts, potentially leading to session hijacking, credential theft, or redirection to malicious sites. The stored nature of this XSS means that the malicious payload persists even after the initial injection, making it particularly dangerous as it can affect multiple users over extended periods. The vulnerability stems from inadequate input validation and output encoding practices within the plugin's codebase, where user-supplied data flows directly into HTML contexts without proper sanitization mechanisms.
From an operational standpoint, this vulnerability poses significant risks to WordPress sites utilizing the affected plugin. Attackers can leverage this weakness to gain unauthorized access to user sessions, potentially compromising administrator accounts and gaining full site control. The impact extends beyond simple script execution as attackers can manipulate the plugin's functionality to redirect users to phishing sites, steal cookies, or inject additional malicious content. The persistent nature of stored XSS means that once exploited, the attack can continue to affect users until the malicious code is manually removed from the database. This vulnerability also violates several ATT&CK framework techniques including T1531 for Establishing Persistence and T1071.001 for Application Layer Protocol for command and control communications.
Mitigation strategies for this vulnerability require immediate action from site administrators to update to the latest version of the wpWax Post Grid, Slider & Carousel Ultimate plugin where the XSS flaw has been patched. Organizations should implement comprehensive input validation and output encoding practices across all user-facing interfaces to prevent similar vulnerabilities from emerging. Regular security audits of WordPress plugins and themes should be conducted to identify potential XSS vectors, with particular attention to how user input is processed and rendered. Additionally, implementing Content Security Policy headers can provide an additional layer of protection against XSS attacks by restricting script execution. Site administrators should also consider implementing web application firewalls to detect and block suspicious input patterns that may indicate attempted XSS exploitation. The vulnerability highlights the importance of maintaining up-to-date security practices and demonstrates how even seemingly minor input validation flaws can result in significant security breaches.