CVE-2026-44584 in Paymenter
Summary
by MITRE • 07/21/2026
Paymenter is a free and open-source webshop solution for management of hosting services. In versions prior to 1.5.0, the email update functionality fails to invalidate the existing verification state when a user changes their email address, allowing a verified account to retain its verified status after switching to an unverified or unowned email address. When a user updated their email address, the system did not reset or revalidate the associated email verification status. As a result, the verification column remained set to “true” even after the email address was changed. Exploitation could potentially result in: misrepresentation of email ownership, bypass of verification-based trust assumptions, and abuse of features gated behind verified status. No direct unauthorized access to other users accounts or data is possible through this issue alone. This issue has been fixed in version 1.5.0.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 07/21/2026
The Paymenter webshop solution presents a significant security vulnerability in its email verification mechanism that stems from inadequate state management during user account modifications. This flaw exists within the system's user authentication and authorization framework, specifically affecting how the platform handles email address changes and associated verification status updates. The vulnerability manifests when users modify their email addresses through the account settings interface, where the application fails to properly invalidate or reset the existing email verification state that was previously established for the original address. This represents a classic case of insufficient input validation and state management in web applications.
The technical implementation flaw resides in the database schema and business logic processing flow that governs user profile updates. When an email change request is processed, the system correctly updates the email field in the user record but neglects to reset the verification status flag that indicates whether the email address has been confirmed by the user through a validation process. This oversight creates a persistent inconsistency between the stored email address and its verification state, effectively allowing users to maintain their verified account status even after switching to addresses they do not control or own. The root cause aligns with CWE-691, which addresses insufficient control flow management in applications where security-relevant states are not properly maintained during operations.
The operational impact of this vulnerability extends beyond simple user experience issues and creates meaningful security implications for the platform's trust model and access controls. An attacker could potentially exploit this weakness by first registering an account with a valid email address, completing the verification process, then changing their email to one they do not own or control while maintaining their verified status. This scenario enables misrepresentation of email ownership and undermines the fundamental assumptions that verification-based features rely upon for security purposes. The vulnerability creates opportunities for abuse of features that are intentionally restricted to verified users, potentially allowing unauthorized access to premium services or privileged functionalities. From an attack perspective, this weakness maps to techniques described in the ATT&CK framework under credential access and privilege escalation categories where attackers manipulate account states to gain unauthorized benefits.
The security implications become more pronounced when considering how verification status affects various platform features and user permissions. Features that require verified email addresses for access control or enhanced functionality could be bypassed by malicious actors who maintain their verified status while switching to uncontrolled email addresses. This creates a persistent threat vector where users can maintain elevated privileges or access rights despite not controlling the associated email address, effectively undermining the platform's security model. The vulnerability also affects the platform's ability to enforce legitimate account ownership verification and could potentially be exploited in phishing or social engineering attacks where attackers leverage their verified status to appear more trustworthy.
Mitigation of this vulnerability requires comprehensive system-level changes that ensure proper state management during user profile modifications. The fix implemented in version 1.5.0 must properly reset the email verification flag whenever a user attempts to change their email address, requiring either immediate re-verification of the new address or explicit invalidation of the verification status until reconfirmation occurs. Organizations should implement robust database constraints and business logic controls that automatically invalidate verification states during email address modifications. The solution should also include logging and monitoring capabilities to detect suspicious account modification patterns that might indicate exploitation attempts. Additional measures could involve implementing rate limiting for email change requests and enhanced audit trails that track when verification status changes occur, providing better visibility into potential abuse of the system's trust model.
This vulnerability demonstrates the importance of maintaining consistent security states throughout user session lifecycle management and highlights how seemingly simple functionality can create significant security risks when proper state validation is omitted. The fix addresses a fundamental flaw in how web applications maintain user authentication contexts during profile modifications, emphasizing the need for comprehensive testing of edge cases involving state transitions in multi-user systems. Organizations should conduct similar reviews of their own applications to identify potential state management issues that could create similar vulnerabilities where security-relevant flags or status indicators are not properly maintained during user data modifications. The lessons learned from this vulnerability underscore the critical importance of considering all possible attack vectors and state transitions when designing secure web applications, particularly those handling user authentication and authorization processes.