CVE-2023-5715 in Website Optimization Plerdy Plugin
Summary
by MITRE • 11/22/2023
The Website Optimization – Plerdy plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's tracking code settings in all versions up to, and including, 1.3.2 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level access, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.
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Analysis
by VulDB Data Team • 04/11/2026
The CVE-2023-5715 vulnerability resides within the Website Optimization – Plerdy plugin for WordPress, representing a critical stored cross-site scripting flaw that compromises the security of affected installations. This vulnerability specifically targets the plugin's tracking code settings functionality, where inadequate input sanitization and output escaping mechanisms fail to properly validate or encode user-supplied data. The flaw affects all versions of the plugin up to and including version 1.3.2, making it a persistent threat across multiple release cycles. The vulnerability's exploitation requires authenticated access with administrator-level privileges, which significantly reduces the attack surface but does not eliminate the risk entirely given the potential for privilege escalation or compromised administrator credentials.
The technical execution of this vulnerability occurs through the manipulation of tracking code settings within the plugin's administrative interface. When administrators input malicious script code into the tracking code fields, the insufficient sanitization allows this code to be stored persistently within the WordPress database. Subsequently, when any user accesses pages that contain the injected script, the malicious code executes within their browser context, potentially leading to session hijacking, data theft, or further compromise of the affected systems. This stored XSS vulnerability operates under the CWE-79 classification, which specifically addresses cross-site scripting flaws where untrusted data is improperly escaped or validated before being rendered in web pages. The vulnerability's impact is particularly concerning because it leverages the elevated privileges of administrators to inject malicious code that can affect all users who access the compromised pages.
The operational impact of CVE-2023-5715 extends beyond simple script execution, creating potential for significant security breaches in multi-site WordPress installations. The vulnerability's requirement for multi-site installations and disabled unfiltered_html settings creates specific deployment conditions that make it particularly dangerous in environments where administrators might be less vigilant about input validation. The attack vector represents a sophisticated approach to privilege-based exploitation, where the attacker's access to administrative functions allows them to inject code that executes in the context of other users' sessions. This creates a pathway for persistent threats that can operate undetected for extended periods, potentially leading to data exfiltration, credential theft, or the establishment of backdoors within the WordPress environment. The ATT&CK framework categorizes this type of vulnerability under T1546.001 for 'Setuid and Setgid' and T1059.001 for 'Command and Scripting Interpreter' techniques, as the malicious code execution can leverage legitimate system processes to achieve its objectives.
Mitigation strategies for CVE-2023-5715 focus primarily on immediate plugin updates to versions that address the input sanitization and output escaping deficiencies. Administrators should prioritize upgrading to the latest available version of the Plerdy plugin, which should contain proper validation and encoding mechanisms. Additionally, implementing strict input validation measures within WordPress installations can provide defense-in-depth protection against similar vulnerabilities. Security administrators should also consider restricting administrative privileges to only those users who absolutely require them, reducing the potential impact of credential compromise. The implementation of Content Security Policy headers can provide additional protection against script execution, though this measure alone does not address the core vulnerability. Regular security audits of WordPress plugins and themes should be conducted to identify similar input validation weaknesses, and organizations should maintain updated vulnerability management processes to ensure timely patch deployment across all systems. The vulnerability serves as a reminder of the critical importance of proper input sanitization and output escaping in web applications, particularly in privileged administrative interfaces where the potential for damage is significantly amplified.