CVE-2026-83941 in Entra
Summary
by MITRE • 09/09/2026
Missing authorization in Entra ID allows an authorized attacker to elevate privileges over a network.
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability described involves a critical failure in the access control mechanisms within Microsoft Entra ID, formerly known as Azure Active Directory. This flaw represents a classic instance of broken object level permissions or missing function-level access controls, where the system fails to verify whether an authenticated user has sufficient privileges to perform specific administrative actions. In this context, an attacker who possesses valid credentials for a lower-privileged account can exploit the lack of proper authorization checks to execute operations reserved for higher-tier administrators. This type of vulnerability is fundamentally rooted in CWE-269, which classifies Improper Privilege Management, and often aligns with MITRE ATT&CK technique T1078, Valid Accounts, where adversaries leverage legitimate credentials to move laterally or escalate privileges within a compromised environment.
The technical mechanism behind this elevation of privilege typically involves manipulating API requests or modifying parameters in the authentication flow such that the backend service processes administrative commands without validating the requester's role against the required permission set. For example, an attacker might attempt to assign themselves global administrator rights, modify conditional access policies, or reset passwords for other high-privilege accounts by sending crafted HTTP requests that bypass standard UI-based restrictions. Because Entra ID serves as the identity backbone for many enterprise cloud environments, this flaw allows a single compromised low-level account to serve as a foothold for complete domain takeover. The absence of strict server-side validation means that client-side security measures or role assignments are insufficient if the underlying API logic does not enforce separation of duties rigorously.
The operational impact of such a vulnerability is severe and potentially catastrophic for organizational security posture. Once an attacker achieves privilege escalation, they gain unrestricted access to sensitive data stored in connected cloud services, including Office 365, Azure resources, and third-party applications integrated via SAML or OAuth. This level of access enables the exfiltration of intellectual property, deployment of ransomware across networked systems, and establishment of persistent backdoors that are difficult to detect due to their origin from legitimate administrative accounts. Furthermore, attackers can disable security logging features or modify audit policies to cover their tracks, significantly hindering incident response efforts. The trust model inherent in identity-centric architectures means that compromising the identity provider effectively compromises every system dependent on it, leading to widespread service disruption and potential regulatory non-compliance under frameworks like GDPR or HIPAA.
Mitigation strategies must focus on implementing defense-in-depth principles rather than relying solely on single-point fixes. Organizations should immediately enforce Multi-Factor Authentication for all administrative accounts and consider using hardware security keys for high-privilege roles to mitigate credential theft risks. Implementing Privileged Identity Management solutions can help by requiring just-in-time access approval for sensitive operations, ensuring that elevated privileges are temporary and audited. Additionally, network segmentation and strict identity governance policies should be reviewed to limit the blast radius of any single compromised account. Regular audits of role assignments and permission sets using tools like Microsoft Entra ID Privileged Access Management will help identify over-provisioned accounts that could serve as vectors for such attacks. Keeping all systems updated with the latest security patches provided by Microsoft is also essential, as vendors frequently release updates to address newly discovered flaws in identity management services.