CVE-2016-20066 in CP Polls Plugin
Summary
by MITRE • 06/15/2026
WordPress CP Polls 1.0.8 contains a persistent cross-site scripting vulnerability that allows attackers to inject malicious scripts through unsanitized file upload functionality. Attackers can upload files containing script payloads with event handlers like onerror attributes to execute arbitrary JavaScript in the browsers of users viewing the affected content.
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Analysis
by VulDB Data Team • 06/15/2026
WordPress CP Polls version 1.0.8 contains a critical persistent cross-site scripting vulnerability that stems from inadequate input sanitization within its file upload functionality. This vulnerability falls under CWE-79 - Improper Neutralization of Input During Web Page Generation, specifically manifesting as a persistent XSS flaw that allows attackers to inject malicious scripts into the application's file upload system. The vulnerability occurs when the plugin fails to properly validate or sanitize file uploads, particularly those containing script payloads with event handlers such as onerror attributes. These malicious scripts can be executed in the browsers of unsuspecting users who view the affected content, creating a persistent threat vector that can affect multiple users over time. The attack vector is particularly dangerous because it leverages the legitimate file upload functionality of the plugin, making it more difficult to detect and prevent. This vulnerability directly maps to attack techniques described in the MITRE ATT&CK framework under T1566 - Phishing and T1203 - Exploitation for Client Execution, where attackers can exploit web application vulnerabilities to execute arbitrary code in user browsers. The persistent nature of the vulnerability means that once malicious content is uploaded and stored on the server, it continues to affect users who access the affected pages until the malicious content is removed or the vulnerability is patched.
The operational impact of this vulnerability extends beyond simple script execution as it creates a potential attack surface for more sophisticated exploits. When users view pages containing the malicious uploaded files, their browsers execute the embedded JavaScript code, which could potentially steal session cookies, redirect users to malicious sites, or even perform actions on behalf of the user. The vulnerability affects the integrity and confidentiality of user data, as the malicious scripts can capture sensitive information or manipulate the user's browsing experience. The persistent nature means that the attack can be maintained over extended periods without requiring repeated exploitation attempts. Security professionals must consider the implications for user trust and application integrity when such vulnerabilities exist in widely used plugins. The vulnerability also represents a significant risk to the WordPress ecosystem as it demonstrates how third-party plugins can introduce security weaknesses that affect entire WordPress installations. Organizations using WordPress CP Polls 1.0.8 face potential data breaches, user privacy violations, and reputational damage if this vulnerability is exploited in the wild.
Mitigation strategies for this vulnerability should focus on immediate patching and input validation improvements. The most effective immediate solution is to upgrade to a patched version of WordPress CP Polls that properly sanitizes file uploads and validates all input before processing. Organizations should implement comprehensive input validation measures that filter out potentially malicious content from file uploads, particularly focusing on event handler attributes and script tags. The implementation of Content Security Policy headers can provide additional protection against XSS attacks by restricting script execution in user browsers. Security teams should conduct thorough penetration testing and vulnerability assessments of WordPress installations to identify similar vulnerabilities in other plugins or themes. Regular security audits of third-party WordPress components are essential to prevent similar issues from occurring in the future. Organizations should also implement proper file type validation and content inspection mechanisms to prevent the upload of executable content. The vulnerability highlights the importance of following secure coding practices and implementing proper input sanitization techniques as outlined in OWASP Top Ten and other security standards. Additionally, network monitoring and intrusion detection systems should be configured to detect suspicious file upload activities and anomalous behavior that may indicate exploitation attempts.