CVE-2026-66440 in WPIDE Plugin
Summary
by MITRE • 08/06/2026
Unauthenticated Cross Site Scripting (XSS) in WPIDE – File Manager & Code Editor <= 3.5.7 versions.
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Analysis
by VulDB Data Team • 08/06/2026
This vulnerability involves an unauthenticated cross site scripting flaw in the WPIDE plugin for WordPress, specifically affecting versions up to and including 3.5.7. The issue stems from inadequate input validation and output escaping mechanisms within the plugin's file management and code editing functionalities. Attackers can exploit this weakness by injecting malicious javascript payloads through parameters that are not properly sanitized before being rendered in the browser context. The vulnerability allows for arbitrary code execution in the victim's browser, potentially enabling session hijacking, data exfiltration, or redirection to malicious sites.
The technical implementation of this XSS vulnerability occurs when user-supplied data flows through the plugin's interface without adequate sanitization. This typically happens in areas where file names, directory paths, or code content are displayed without proper HTML encoding or context-appropriate escaping. The flaw exists because the plugin fails to validate and sanitize inputs that are directly incorporated into dynamic web content, creating an attack surface where malicious scripts can be executed when legitimate users view affected pages.
The operational impact of this vulnerability is significant for WordPress administrators and end-users who have WPIDE installed on their sites. An unauthenticated attacker can leverage this flaw to compromise user sessions, steal sensitive information, or manipulate the plugin's functionality without requiring any prior authentication credentials. This makes the vulnerability particularly dangerous as it can be exploited by anyone with access to the affected website, potentially affecting all users who interact with the plugin's interface. The attack could lead to complete compromise of the WordPress installation if combined with other exploitation techniques.
Security mitigations for this vulnerability should include immediate patching to version 3.5.8 or later where the XSS flaws have been addressed through proper input validation and output sanitization. Administrators should also implement additional defensive measures such as web application firewalls that can detect and block malicious script payloads, regular security audits of installed plugins, and monitoring for unusual activity in plugin-related directories. The vulnerability aligns with CWE-79 which categorizes cross site scripting flaws, and may map to ATT&CK technique T1566.001 related to spearphishing attachments and T1059.001 for command and scripting interpreter execution through web-based interfaces.
Organizations should conduct comprehensive vulnerability assessments to identify all instances of the affected plugin version and ensure complete remediation. Regular security updates and patch management procedures should be implemented to prevent similar vulnerabilities from arising in the future, particularly focusing on input validation and output escaping mechanisms across all web application components. The incident highlights the importance of maintaining current software versions and implementing robust security controls around content management systems and their plugins.