CVE-2026-107671 in ONE
Summary
by MITRE • 10/27/2026
A vulnerability allowing an attacker with valid Administrator credentials to bypass multi-factor authentication by disabling it globally before completing MFA verification.
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Analysis
by VulDB Data Team • 10/27/2026
The described vulnerability represents a critical flaw in the implementation of Multi-Factor Authentication (MFA) policies, specifically involving privilege escalation and policy enforcement gaps within identity management systems. This issue allows an attacker who has already obtained valid Administrator credentials to circumvent the security controls intended to protect administrative accounts. The core technical failure lies in the system's handling of configuration changes versus authentication state checks. Typically, MFA is enforced as a mandatory step before granting access to sensitive resources or performing privileged actions. However, this vulnerability exploits a race condition or logical flaw where an administrator can modify global security policies, specifically disabling the requirement for multi-factor authentication, prior to completing the initial verification challenge. This sequence of events effectively nullifies the protective barrier that MFA is designed to provide, allowing full system access without the second factor of identity proof.
From a technical perspective, this vulnerability aligns with CWE-284, Improper Access Control, as it involves an actor bypassing intended restrictions through misconfigured or improperly enforced policy checks. It also relates closely to CWE-693, Protection Mechanism Failure, where the security mechanism fails to prevent unauthorized access despite being enabled. The flaw suggests that the system does not enforce a lock on configuration changes during active authentication sessions or lacks atomicity in applying policy updates relative to session validation. Consequently, an attacker with high-level privileges can alter the fundamental trust model of the environment by removing the requirement for additional verification factors globally. This action effectively downgrades the security posture from multi-factor to single-factor authentication for all users and services relying on that configuration, creating a persistent backdoor if not immediately detected and reverted.
The operational impact of this vulnerability is severe, particularly in environments where administrative accounts are targeted by threat actors who have already compromised initial credentials through phishing, credential stuffing, or other means. By disabling MFA globally before completing the verification step, an attacker can establish long-term persistence without triggering alerts associated with anomalous login behavior from new devices or locations. This bypass undermines the primary defense against credential theft attacks, which are among the most common vectors for data breaches and ransomware deployment. Furthermore, because the change is made at a global level, it affects all users within the domain, potentially exposing non-administrative accounts to increased risk if the attacker maintains control over the administrative console. The ability to disable security controls remotely without completing authentication steps represents a significant degradation of trust in identity-centric security architectures.
This behavior maps directly to several techniques in the MITRE ATT&CK framework. It corresponds to T1098, Account Manipulation, specifically the sub-technique of modifying account properties or permissions to reduce friction for future access. Additionally, it relates to T1546, Event Triggered Execution, if the policy change is tied to specific system states, though more accurately it falls under privilege abuse and configuration manipulation. The vulnerability highlights a critical gap in zero-trust implementations where administrative actions must be strictly separated from authentication processes or require additional approval workflows that are not susceptible to bypass during active sessions.
Mitigation strategies for this issue involve both immediate remediation and long-term architectural improvements. Administrators should immediately audit global MFA settings across all identity providers and directory services to ensure they remain enabled, particularly after any administrative changes have been made. Implementing role-based access control (RBAC) with strict separation of duties can help; specifically, the ability to modify authentication policies should be restricted to a subset of highly privileged accounts that are themselves protected by hardware-backed MFA or out-of-band approval workflows. Additionally, enabling audit logging for all policy changes and configuring alerts for any modification to security settings is essential for rapid detection. From an architectural standpoint, systems must enforce atomic operations where configuration updates cannot occur until the current authentication session has fully terminated and re-verified its privileges. Regular penetration testing focused on identity management flaws and continuous monitoring of administrative activity logs are critical components in maintaining resilience against such bypass attempts.