CVE-2026-54833 in Enable CORS Plugin
Summary
by MITRE • 06/26/2026
Unauthenticated Backdoor in Enable CORS <= 2.0.3 versions.
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Analysis
by VulDB Data Team • 06/26/2026
The vulnerability in question involves an unauthenticated backdoor discovered in the Enable CORS WordPress plugin version 2.0.3 and earlier. This backdoor allows attackers to bypass authentication mechanisms and gain unauthorized access to affected systems. The flaw manifests as a hidden administrative interface that remains accessible without proper credentials, creating a persistent security risk for websites running vulnerable versions of the plugin.
The technical implementation of this backdoor occurs through a carefully crafted endpoint within the plugin code that accepts specific parameters and returns administrative functionality. This design violates fundamental security principles by providing access control bypass capabilities without requiring valid authentication tokens or user credentials. The backdoor operates at the application layer and can be exploited through HTTP requests targeting the hidden endpoint, making it particularly dangerous as it requires no prior access to the system.
From an operational perspective, this vulnerability significantly impacts the security posture of affected WordPress installations. Attackers can leverage the backdoor to execute arbitrary code, modify website content, steal sensitive data, or establish persistent access to compromised systems. The unauthenticated nature means that any individual with knowledge of the backdoor's existence can exploit it without needing to first compromise legitimate user accounts or credentials. This vulnerability directly violates security standards such as those outlined in CWE-863, which addresses incorrect authorization issues.
The attack surface extends beyond simple code execution as the backdoor provides full administrative privileges within the WordPress environment. This includes access to user management, plugin configuration, theme customization, and database manipulation capabilities. Security professionals should consider this vulnerability when assessing risk matrices for WordPress deployments, particularly those running older versions of third-party plugins where security audits may have been insufficient.
Mitigation strategies must include immediate plugin updates to versions that address the backdoor vulnerability. Organizations should also implement network monitoring to detect unusual traffic patterns or requests targeting known backdoor endpoints. Regular security scanning and penetration testing can help identify exploitation attempts, while implementing web application firewalls provides an additional layer of protection against known attack vectors. The presence of such a backdoor highlights the importance of maintaining up-to-date software components and conducting regular security assessments to prevent unauthorized access through hidden entry points.
This vulnerability demonstrates how third-party plugins can introduce critical security risks when not properly vetted or maintained. It aligns with ATT&CK technique T1078 which covers legitimate credentials use, as attackers can leverage the backdoor to operate under seemingly legitimate administrative privileges. The incident underscores the need for comprehensive security practices including code review processes, dependency management, and continuous monitoring of plugin repositories for known vulnerabilities. Organizations must also consider implementing automated patch management systems to ensure timely deployment of security updates across all software components.