CVE-2026-15616 in Logto
Summary
by MITRE • 07/23/2026
Logto does not enforce locally configured MFA during SSO authentication, allowing users to bypass second-factor requirements and grants unauthorized access.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 07/23/2026
The vulnerability in Logto represents a critical security flaw that undermines the integrity of single sign-on authentication processes by failing to enforce multi-factor authentication requirements. This issue stems from the application's improper handling of locally configured multi-factor authentication policies during single sign-on scenarios, creating a significant gap in the security architecture that adversaries can exploit to gain unauthorized access to protected systems and data.
The technical flaw manifests as a failure in the authentication flow where Logto accepts user credentials through SSO mechanisms without validating whether the configured MFA requirements have been satisfied. This represents a direct violation of security best practices outlined in the Open Web Application Security Project (OWASP) authentication guidelines, specifically addressing the principle of least privilege and proper authentication enforcement. The vulnerability can be categorized under CWE-305 Authentication Bypass Through Multiple Means, which describes scenarios where multiple authentication factors are not properly enforced or validated.
From an operational perspective, this vulnerability creates a substantial risk landscape for organizations relying on Logto for identity management and access control. Attackers can exploit this weakness by authenticating through SSO channels without providing the required second-factor authentication, effectively bypassing security controls that were specifically implemented to protect sensitive resources. The impact extends beyond individual account compromise to potentially enable broader lateral movement within networks, as compromised accounts may have elevated privileges or access to critical systems.
The vulnerability aligns with several tactics described in the MITRE ATT&CK framework under the Authentication category, particularly focusing on credential access techniques where adversaries seek to bypass authentication mechanisms. This weakness can be exploited as part of a broader attack chain where initial access is gained through SSO compromise, followed by privilege escalation or lateral movement. Organizations using Logto for identity management face increased risk of unauthorized data access and potential compliance violations.
Mitigation strategies should include immediate implementation of security patches or code modifications to ensure MFA requirements are enforced during all authentication scenarios, including SSO flows. Organizations should also consider implementing additional monitoring and logging controls to detect anomalous authentication patterns that might indicate exploitation attempts. Configuration reviews should verify that multi-factor authentication policies are consistently applied across all authentication pathways, with proper enforcement mechanisms in place to prevent bypass of security controls. Regular security assessments and penetration testing can help identify similar vulnerabilities in related systems and ensure comprehensive protection against credential-based attacks.