CVE-2018-7543 in Duplicator Plugin
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in installer/build/view.step4.php of the SnapCreek Duplicator plugin 1.2.32 for WordPress allows remote attackers to inject arbitrary JavaScript or HTML via the json parameter.
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Analysis
by VulDB Data Team • 02/02/2026
The CVE-2018-7543 vulnerability represents a critical cross-site scripting flaw within the SnapCreek Duplicator plugin version 1.2.32 for WordPress systems. This vulnerability specifically affects the installer/build/view.step4.php component and exposes web applications to remote code execution risks through improper input validation mechanisms. The flaw manifests when the json parameter is processed without adequate sanitization, creating an avenue for malicious actors to inject arbitrary JavaScript or HTML code into the application's response.
The technical implementation of this vulnerability stems from insufficient output encoding and input validation practices within the plugin's installation process. When the system processes the json parameter, it fails to properly escape or validate the incoming data before rendering it in the web page context. This primitive security oversight allows attackers to craft malicious payloads that can execute within the browser context of authenticated users who visit the compromised installation page. The vulnerability operates at the application layer and can be exploited through various attack vectors including web-based delivery mechanisms, making it particularly dangerous in environments where administrators may inadvertently click on malicious links or visit compromised websites.
The operational impact of this vulnerability extends beyond simple data theft or defacement, as it provides attackers with the capability to establish persistent access patterns within compromised WordPress environments. Attackers can leverage this XSS vector to perform session hijacking, redirect users to malicious sites, or inject additional malicious code that could escalate to full system compromise. The vulnerability affects all versions of the Duplicator plugin prior to the patched release, creating a substantial attack surface for threat actors who maintain lists of known vulnerable WordPress installations. According to CWE classification, this represents a classic example of CWE-79: Improper Neutralization of Input During Web Page Generation, which is one of the most common and dangerous web application vulnerabilities in the OWASP Top Ten list.
Mitigation strategies for CVE-2018-7543 require immediate attention through plugin version updates and comprehensive security hardening measures. Administrators should prioritize updating to the latest version of the SnapCreek Duplicator plugin where the vulnerability has been patched through proper input sanitization and output encoding mechanisms. Network-based protections such as web application firewalls can provide additional layers of defense by filtering suspicious json parameter values before they reach the vulnerable application code. Security monitoring should include detection of unusual installation activity patterns and regular scanning for vulnerable plugin versions across the entire WordPress ecosystem. The ATT&CK framework categorizes this vulnerability under T1213: Data from Information Repositories, as attackers can leverage the compromised installation process to gain access to sensitive data and establish footholds within target networks. Organizations should implement regular security audits of their WordPress installations, maintain updated vulnerability databases, and ensure that all third-party plugins undergo security assessments before deployment to production environments.