CVE-2026-66681 in Theme My Login Plugin
Summary
by MITRE • 08/06/2026
Unauthenticated Cross Site Request Forgery (CSRF) in Theme My Login <= 7.1.14 versions.
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Analysis
by VulDB Data Team • 08/06/2026
Cross site request forgery vulnerabilities represent one of the most persistent and dangerous threats in web application security, particularly when they affect authentication and user management systems. The specific vulnerability identified in Theme My Login versions up to 7.1.14 demonstrates a critical flaw that allows attackers to execute unauthorized actions on behalf of authenticated users without their knowledge or consent. This particular implementation fails to properly validate the origin of requests, creating an avenue for malicious actors to craft forged requests that appear legitimate to the target application's security mechanisms.
The technical nature of this vulnerability stems from the absence of proper anti-csrf token validation within the plugin's request processing logic. When users access certain administrative functions or perform actions such as password resets, user registration modifications, or theme customizations, the system should verify that these requests originate from legitimate sources within the same domain. However, in vulnerable versions of Theme My Login, this verification mechanism is either completely missing or inadequately implemented, allowing attackers to exploit the trust relationship between the browser and the application server.
From an operational perspective, this vulnerability creates significant risk for WordPress installations that rely on Theme My Login for user management and authentication workflows. Attackers can leverage this weakness to perform unauthorized modifications to user accounts, potentially escalating privileges, changing passwords, or manipulating user access controls without requiring valid credentials. The impact extends beyond simple account compromise as the vulnerability affects the core authentication infrastructure of the platform, potentially enabling more sophisticated attacks such as privilege escalation or persistent backdoor establishment within the application environment.
The exploitation of this CSRF vulnerability aligns with several techniques documented in the attack framework, particularly those involving session manipulation and unauthorized administrative actions. According to CWE standards, this represents a classic implementation flaw where proper input validation and request origin verification mechanisms are absent from critical security functions. The vulnerability also maps to ATT&CK technique T1548.002 which covers abuse of cloud services for privilege escalation, as compromised user accounts could be leveraged to gain elevated access within the application environment.
Organizations affected by this vulnerability should immediately implement mitigations including updating to Theme My Login version 7.1.15 or later, which contains proper CSRF token validation mechanisms. Additionally, administrators should review their WordPress security configurations and consider implementing additional protective measures such as custom authentication tokens, referer header validation, and web application firewalls that can detect and block suspicious request patterns. The implementation of Content Security Policy headers and proper session management practices should also be reviewed to provide defense-in-depth against similar vulnerabilities in other components of the web application stack.
Security monitoring should be enhanced to detect unusual administrative activities or patterns of requests that may indicate CSRF attack attempts, with particular attention to authentication-related functions and user management operations. Regular security audits of third-party plugins and themes should be conducted to identify other potential sources of similar vulnerabilities, as this represents a common pattern in poorly secured WordPress plugins that handle sensitive user operations. The vulnerability also underscores the importance of maintaining up-to-date security practices within CMS environments where plugin security can significantly impact overall system integrity and user data protection.