CVE-2026-16751 in Museum Server
Summary
by MITRE • 07/29/2026
Authorization Bypass in the emergency recovery approval component in Ente Technologies Ente Museum Server allows an authenticated attacker configured as a victim's emergency contact to bypass the configured recovery waiting period and take over the victim's account via a crafted `approve-recovery` API request.
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Analysis
by VulDB Data Team • 07/30/2026
This vulnerability represents a critical authorization bypass flaw within the emergency recovery mechanism of the Ente Museum Server platform. The issue stems from insufficient validation controls in the recovery approval component that fails to properly enforce the configured waiting period for emergency account recovery requests. An authenticated attacker who has been designated as a victim's emergency contact can exploit this weakness by crafting a specific API request to the approve-recovery endpoint, thereby circumventing the intended security controls that are meant to delay account takeover operations.
The technical implementation of this vulnerability lies in the lack of proper access control verification within the recovery approval workflow. When an emergency recovery request is initiated, the system should enforce a mandatory waiting period before allowing any recovery actions to proceed. However, the flawed authorization logic permits immediate approval when an emergency contact makes a request, effectively removing the security buffer that is essential for preventing unauthorized account takeovers. This weakness operates at the application layer and specifically affects the API endpoint responsible for processing recovery approvals.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass full account compromise capabilities. An attacker with emergency contact credentials can immediately assume control of victim accounts without waiting for the configured security period, potentially leading to data theft, unauthorized access to sensitive information, and complete system compromise. The vulnerability is particularly dangerous because it leverages legitimate emergency contact relationships that are typically trusted by the system, making it difficult to detect malicious activity. This flaw directly violates fundamental security principles of least privilege and time-based access controls.
Security implications of this vulnerability align with CWE-863, which addresses "Incorrect Authorization," and can be categorized under ATT&CK technique T1531 for 'Account Access Removal' and T1078 for 'Valid Accounts'. The flaw creates a pathway for attackers to bypass time-based security controls that are specifically designed to prevent automated account takeover attempts. Organizations using the Ente Museum Server platform face significant risk of unauthorized access to user accounts, potential data breaches, and compromise of sensitive museum collections or visitor information. The vulnerability demonstrates poor implementation of security controls and highlights the importance of proper input validation and access control enforcement in critical system components.
Mitigation strategies should focus on implementing robust authorization checks that enforce the configured waiting period regardless of the requester's relationship to the victim account. The API endpoint must validate that sufficient time has elapsed since the recovery request was initiated before allowing approval actions. Additional controls include implementing rate limiting for recovery requests, adding multi-factor authentication requirements for emergency approvals, and logging all recovery activities for audit purposes. Organizations should also consider implementing a more granular permission model where emergency contacts cannot bypass system-enforced waiting periods without additional authorization from system administrators or security personnel. Regular security testing and code reviews should be conducted to identify similar authorization bypass vulnerabilities in other system components.
The vulnerability demonstrates the critical importance of proper access control implementation in emergency recovery systems, where temporary access privileges should never override core security controls. The flaw emphasizes the need for comprehensive security testing that includes validation of time-based controls, proper authorization enforcement, and verification of trust relationships within system components. Organizations must ensure that emergency recovery mechanisms provide convenience without compromising fundamental security principles, as these systems often become primary targets for attackers seeking unauthorized access to user accounts.