CVE-2026-69851 in Entra
Summary
by MITRE • 08/21/2026
Server-side request forgery (ssrf) in Azure Active Directory allows an authorized attacker to elevate privileges over a network.
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Analysis
by VulDB Data Team • 08/21/2026
The vulnerability described constitutes a Server-Side Request Forgery, commonly abbreviated as SSRF, within the context of Microsoft Azure Active Directory services. This class of flaw arises when a web application or cloud service accepts user-supplied input and uses that data to construct URLs for server-side requests without sufficiently validating the destination address. In this specific instance, an attacker who has already obtained valid authentication credentials can manipulate these inputs to force the Azure AD infrastructure to initiate HTTP or HTTPS requests to internal resources that are not intended to be publicly accessible. This mechanism effectively bypasses network perimeter defenses because the request originates from a trusted service account within the cloud provider's own environment rather than from an external, untrusted source.
The technical flaw lies in the insufficient validation of destination addresses during server-side operations. When Azure Active Directory processes requests that involve fetching metadata, integrating with third-party services, or performing backend authentication flows, it may accept URLs provided by the authenticated user. If these inputs are not strictly sanitized to prevent access to internal IP ranges, localhost endpoints, or cloud instance metadata service addresses, an attacker can craft malicious payloads targeting sensitive internal APIs. This allows the attacker to leverage the elevated privileges of the Azure AD service itself to probe and interact with backend systems that reside behind firewalls which would normally block direct external connections.
The operational impact of this vulnerability is significant due to the potential for privilege escalation within the network architecture. By exploiting SSRF, an authorized user can access internal management interfaces, retrieve sensitive configuration data, or even execute commands on underlying infrastructure components if those services are vulnerable to further exploitation chains. This capability undermines the principle of least privilege and allows a standard authenticated user to perform actions typically reserved for administrative accounts. The attacker gains visibility into network topology and service configurations that should remain isolated from end-user applications, thereby increasing the attack surface for subsequent lateral movement or data exfiltration activities.
From a classification perspective, this vulnerability aligns with CWE-918, which defines Server-Side Request Forgery as a weakness where an application makes requests to URLs provided by users without proper validation of their safety and legitimacy. Furthermore, in terms of tactical behavior within the MITRE ATT&CK framework for cloud environments, this activity corresponds to T1557, Adversary-in-the-Middle, specifically when used to intercept or manipulate communications between services, as well as T1098, Account Manipulation, if the SSRF is leveraged to modify service principal permissions. It also relates to T1652, Misuse of Cloud Infrastructure, where attackers exploit cloud-specific features like metadata endpoints for reconnaissance and access.
Mitigation strategies must focus on strict input validation and network segmentation within Azure AD configurations. Administrators should ensure that any user-controllable parameters used in server-side requests are validated against a whitelist of allowed domains or IP ranges rather than relying solely on blacklist approaches which can be easily bypassed using encoding techniques or alternative address formats such as IPv6 representations or DNS rebinding attacks. Implementing egress filtering rules at the network level to restrict outbound connections from Azure AD services to only necessary external endpoints is critical. Additionally, enabling detailed logging and monitoring for anomalous request patterns originating from authenticated users can help detect exploitation attempts in real time. Regular security assessments that include SSRF testing against cloud identity providers are essential to maintain a robust defense posture.