CVE-2026-58503 in Frappe
Summary
by MITRE • 07/10/2026
Frappe is a full-stack web application framework. Prior to 16.16.0 and 15.106.0, user enumeration could be performed via the reset_password endpoint. This issue is fixed in versions 16.16.0 and 15.106.0.
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Analysis
by VulDB Data Team • 07/11/2026
The vulnerability in Frappe web application framework represents a significant security weakness that allows unauthorized users to enumerate valid user accounts through the reset_password endpoint. This issue affects versions prior to 16.16.0 and 15.106.0, creating an exploitable vector for reconnaissance activities. The flaw enables attackers to determine which email addresses are registered within the system by observing different response behaviors when attempting to reset passwords for various user accounts.
The technical implementation of this vulnerability stems from insufficient input validation and response handling within the password reset functionality. When a user attempts to reset a password, the endpoint should provide consistent responses regardless of whether the account exists or not. However, in vulnerable versions, the system returns different error messages or status codes based on whether the target email address corresponds to an existing user account. This differential response behavior directly exposes user enumeration capabilities to external threat actors who can systematically test various email addresses to build a comprehensive list of valid users within the application.
From an operational impact perspective, this vulnerability significantly increases the risk of targeted attacks against the application's user base. Attackers can leverage this information to conduct more sophisticated social engineering campaigns, password spraying attacks, or brute force attempts specifically targeting known valid accounts. The exposure of user enumeration data undermines fundamental security principles and creates a foundation for more advanced exploitation techniques that could lead to unauthorized access, account compromise, and potential data breaches.
The vulnerability aligns with CWE-200, which addresses improper exposure of sensitive information, and represents a clear violation of the principle of least privilege in authentication systems. This weakness also correlates with ATT&CK technique T1078.004, which covers valid accounts access through credential reuse or enumeration attacks. The security implications extend beyond immediate account compromise as the exposed user lists can facilitate further reconnaissance activities including identifying potential targets for spear-phishing campaigns or mapping out the application's user landscape for more sophisticated attack vectors.
Organizations utilizing affected Frappe versions should immediately implement mitigation strategies focusing on consistent response handling across authentication endpoints. The recommended solution involves updating to versions 16.16.0 or 15.106.0 where the vulnerability has been addressed through proper input validation and standardized error responses. Additionally, implementing rate limiting mechanisms on password reset requests can further reduce the effectiveness of enumeration attempts while maintaining legitimate user functionality. Security teams should also consider deploying monitoring solutions to detect unusual patterns in authentication endpoint usage that might indicate active enumeration activities.
The fix implemented in patched versions addresses the core issue by ensuring that all password reset requests receive identical responses regardless of account existence, thereby eliminating the information disclosure mechanism. This approach follows security best practices for maintaining consistent error handling and prevents attackers from gaining intelligence about the system's user base through differential response analysis. The resolution demonstrates proper application of the principle of defense in depth, where multiple layers of security controls work together to prevent information leakage while preserving legitimate functionality.
Organizations should conduct comprehensive security assessments to identify any additional endpoints that might exhibit similar enumeration vulnerabilities and ensure that all authentication-related functionalities implement consistent error handling mechanisms. Regular security audits and penetration testing should include validation of response consistency across authentication flows to prevent similar issues from emerging in the future. The vulnerability serves as a reminder of the critical importance of proper input validation and consistent error handling in web applications, particularly those handling sensitive user authentication data.
This type of vulnerability highlights the ongoing need for security awareness in software development practices, emphasizing that seemingly minor implementation details can create significant security risks. The enumeration flaw demonstrates how information disclosure during authentication processes can undermine broader security controls and provides attackers with valuable reconnaissance data that can be leveraged for more sophisticated attacks against the application ecosystem.