CVE-2024-47340 in Post Grid and Gutenberg Blocks Plugin
Summary
by MITRE • 10/06/2024
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in PickPlugins Post Grid and Gutenberg Blocks post-grid allows Stored XSS.This issue affects Post Grid and Gutenberg Blocks: from n/a through <= 2.2.89.
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Analysis
by VulDB Data Team • 04/05/2026
This vulnerability represents a critical cross-site scripting flaw that enables attackers to inject malicious scripts into web pages viewed by other users. The weakness specifically resides in the PickPlugins Post Grid and Gutenberg Blocks plugin, where input validation fails during the web page generation process. The vulnerability allows for stored XSS attacks, meaning malicious payloads can be permanently stored on the server and executed whenever affected pages are accessed by unsuspecting users. This type of vulnerability falls under CWE-79 which categorizes improper neutralization of input during web page generation, making it particularly dangerous as the malicious code persists beyond a single user interaction.
The technical exploitation occurs when users submit content through the post grid functionality without proper input sanitization. Attackers can craft malicious payloads that get stored within the plugin's data structures and subsequently executed in the context of other users' browsers. This stored nature of the vulnerability means that even if the initial injection occurs during content creation, the malicious script will continue to execute for every user who views the affected pages. The vulnerability affects versions of the plugin up to and including 2.2.89, indicating that the input validation mechanisms were insufficiently implemented or updated to address known XSS attack vectors.
The operational impact of this vulnerability extends beyond simple script execution, as it can lead to complete session hijacking, credential theft, and unauthorized administrative actions. Attackers can leverage the stored XSS to steal cookies, redirect users to malicious sites, or even perform actions on behalf of authenticated users. The attack surface is particularly concerning given that this affects content management systems where users may have varying privilege levels, potentially allowing attackers to escalate their privileges through session manipulation or by injecting malicious scripts that can interact with the underlying application. This vulnerability directly maps to ATT&CK technique T1566.001 which involves the use of malicious content to exploit web applications.
Mitigation strategies should prioritize immediate plugin updates to versions that address this vulnerability, as well as implementing comprehensive input sanitization measures. Organizations should deploy web application firewalls that can detect and block suspicious script injection attempts, while also implementing content security policies to prevent execution of unauthorized scripts. Regular security audits of plugin installations and user input handling should be conducted to identify similar vulnerabilities. The remediation process must include thorough testing to ensure that all user-generated content is properly sanitized before storage and rendering, implementing proper output encoding for all dynamic content to prevent script execution in browser contexts. Additionally, administrators should consider implementing privilege separation and monitoring for unusual content submissions that may indicate attempted exploitation of this vulnerability.