CVE-2026-56305 in Capgo
Summary
by MITRE • 07/10/2026
Capgo before 12.128.2 contains an authentication bypass vulnerability in the password change endpoint that allows attackers to change user passwords without requiring current password confirmation. Attackers with temporary session access can exploit this flaw to permanently lock out legitimate users and achieve full account takeover.
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Analysis
by VulDB Data Team • 07/10/2026
The vulnerability identified in Capgo versions prior to 12.128.2 represents a critical authentication bypass flaw that directly undermines the security posture of user accounts within the application. This weakness exists within the password change endpoint functionality where proper authentication verification mechanisms have been omitted or improperly implemented, allowing unauthorized individuals to manipulate account credentials without providing legitimate proof of identity. The flaw specifically targets the password modification workflow and demonstrates a fundamental failure in access control validation that violates established security principles for credential management systems.
This authentication bypass vulnerability operates through a well-defined technical mechanism where the system fails to validate whether the requester possesses legitimate authorization to modify account passwords. When attackers gain temporary session access to an account, they can leverage this flaw to execute password changes without presenting the current password as required for account security. The implementation lacks proper session validation and authentication checks that should normally verify the user's identity before permitting any credential modifications. This technical oversight creates a persistent vector for unauthorized access that persists beyond the initial session compromise.
The operational impact of this vulnerability extends far beyond simple unauthorized access, creating severe consequences for both individual users and the broader system infrastructure. Attackers can leverage this flaw to permanently lock out legitimate users by changing their passwords, effectively denying them access to their own accounts while simultaneously gaining full control over those credentials. The compromised accounts become fully exploitable by attackers who can then navigate the application with complete user privileges, potentially accessing sensitive data, performing unauthorized transactions, or using the compromised accounts for further attacks against other systems. This account takeover capability represents a complete failure of the authentication system and creates a persistent threat vector.
From a cybersecurity framework perspective, this vulnerability aligns with CWE-287 which addresses improper authentication issues in software systems. The flaw also maps to ATT&CK technique T1078.004 which covers legitimate credentials for unauthorized access, demonstrating how an authentication bypass can enable persistent access to compromised accounts. Organizations should implement immediate mitigations including strengthening the password change endpoint with proper authentication verification mechanisms, enforcing multi-factor authentication requirements, and implementing session management controls that prevent unauthorized credential modifications. Additionally, security monitoring should be enhanced to detect unusual password change patterns and unauthorized account access attempts.
The root cause of this vulnerability stems from inadequate input validation and missing authentication checks within the password modification workflow. Proper implementation should require current password confirmation or alternative authentication factors before allowing credential changes, ensuring that only authorized users can modify account information. This flaw highlights the importance of following secure coding practices and implementing comprehensive security controls throughout application development lifecycle processes. Organizations must conduct thorough security testing including penetration testing and code reviews to identify similar authentication bypass vulnerabilities that could compromise user accounts and system integrity. The vulnerability serves as a reminder that even seemingly simple functionality like password changes requires robust security measures to prevent unauthorized access and maintain system trust relationships.