CVE-2024-33554 in XStore Core Plugin
Summary
by MITRE • 04/29/2024
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in 8theme XStore Core allows Reflected XSS.This issue affects XStore Core: from n/a through 5.3.5.
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Analysis
by VulDB Data Team • 04/03/2025
The vulnerability identified as CVE-2024-33554 represents a critical cross-site scripting flaw within the 8theme XStore Core plugin ecosystem. This reflected XSS vulnerability occurs during the web page generation process when input parameters are improperly handled, creating an avenue for malicious actors to inject client-side scripts into web pages viewed by other users. The vulnerability specifically impacts versions of XStore Core ranging from an unspecified initial version through 5.3.5, indicating a broad attack surface across multiple iterations of the plugin. The flaw resides in the improper neutralization of input data that flows through the web application's user interface generation mechanisms, making it particularly dangerous as it can be exploited through various input vectors including URL parameters, form fields, or API endpoints that process user-supplied data.
The technical exploitation of this vulnerability follows standard reflected XSS attack patterns where an attacker crafts malicious payloads that are reflected back to users through the vulnerable application's response. When a victim visits a specially crafted URL containing the malicious script, the payload executes in the victim's browser context, potentially leading to session hijacking, credential theft, or redirection to malicious sites. The vulnerability operates at the application layer and requires no special privileges to exploit, making it particularly dangerous for widely used plugins like XStore Core that power numerous wordpress websites. The reflected nature of the vulnerability means that the malicious script is not stored on the server but rather injected into the web application's response in real-time, which complicates detection and mitigation efforts. This flaw directly maps to CWE-79 which defines the improper neutralization of input during web page generation as a fundamental weakness in web application security.
The operational impact of this vulnerability extends beyond simple script execution, potentially compromising entire user sessions and enabling sophisticated attack vectors such as credential harvesting, data exfiltration, and unauthorized administrative actions. Attackers can leverage this vulnerability to perform session fixation attacks, steal cookies, or redirect users to phishing sites that mimic legitimate interfaces. The widespread adoption of XStore Core across numerous wordpress installations amplifies the potential damage, as a successful exploitation could affect hundreds or thousands of websites simultaneously. Additionally, the vulnerability's presence in multiple versions suggests that organizations may have been exposed for extended periods without awareness, creating potential backdoors for persistent threat actors. The reflected nature of the attack also means that detection becomes more challenging as the malicious payloads are only present in the HTTP response for a single request, making traditional security monitoring less effective.
Organizations should implement comprehensive mitigation strategies that include input validation, output encoding, and proper content security policy implementation. The most effective immediate solution involves upgrading to the latest version of XStore Core where the vulnerability has been patched, though organizations should also implement additional security controls such as web application firewalls, strict input sanitization, and regular security audits. Security teams should also consider implementing CSP headers to prevent execution of unauthorized scripts, while monitoring for suspicious user behavior and unusual traffic patterns that might indicate exploitation attempts. The vulnerability demonstrates the critical importance of proper input validation and output encoding in preventing XSS attacks, aligning with ATT&CK technique T1059.002 for command and scripting interpreter usage and T1566.001 for credential access through social engineering. Organizations must also ensure that their security monitoring systems are configured to detect reflected XSS attempts and that regular vulnerability assessments include thorough testing of web application inputs and outputs to prevent similar issues from arising in other components of their digital infrastructure.