CVE-2026-59115 in Entra Provisioning Service
Summary
by MITRE • 08/07/2026
'.../...//' in Microsoft Entra Provisioning Service (SyncFabric) allows an authorized attacker to elevate privileges over a network.
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Analysis
by VulDB Data Team • 08/07/2026
The vulnerability in Microsoft Entra Provisioning Service within the SyncFabric component represents a critical path traversal flaw that enables authenticated attackers to escalate their privileges across network boundaries. This issue stems from inadequate input validation and path resolution mechanisms within the provisioning service infrastructure, allowing malicious actors with legitimate credentials to manipulate file system access patterns through crafted directory traversal sequences. The vulnerability specifically manifests when the system processes paths containing double forward slashes followed by additional path components, creating opportunities for unauthorized access to restricted resources.
The technical implementation of this flaw involves the exploitation of weak sanitization routines that fail to properly normalize or validate path strings before processing them within the provisioning pipeline. When an authenticated user submits a request containing malformed path references such as '.../...//', the underlying synchronization service may interpret these sequences in ways that bypass intended access controls and authorization checks. This behavior aligns with common software security weaknesses documented under CWE-22 Path Traversal vulnerabilities, where insufficient input validation allows attackers to manipulate file system paths to access unauthorized resources.
From an operational perspective, this vulnerability creates significant risk for organizations relying on Microsoft Entra for identity provisioning and synchronization services. Attackers who have gained initial access through legitimate authentication mechanisms can leverage this flaw to move laterally within the network infrastructure, potentially accessing sensitive configuration data, user credentials, or system files that should remain protected. The impact extends beyond simple privilege escalation as it enables attackers to manipulate the provisioning process itself, potentially allowing them to inject malicious configurations or redirect synchronization operations to compromised endpoints.
The security implications of this vulnerability align with tactics and techniques identified in the MITRE ATT&CK framework under privilege escalation and lateral movement categories. Specifically, this flaw supports techniques such as credential access through path traversal and persistence mechanisms that could allow attackers to maintain long-term access to provisioned environments. Organizations utilizing Microsoft Entra Provisioning Service should consider this vulnerability as part of a broader attack surface assessment, particularly in environments where the provisioning service operates with elevated privileges or has access to sensitive network resources.
Mitigation strategies should focus on implementing robust input validation mechanisms within the SyncFabric component, including normalization of path references and strict enforcement of access control policies. Organizations should also deploy monitoring solutions capable of detecting anomalous path traversal patterns in provisioning service logs, while ensuring that authentication controls remain strong and multi-factor authentication is implemented where possible. Regular security assessments of the provisioning infrastructure should include validation of path handling routines and verification that all input processing conforms to established security standards. Microsoft has likely addressed this vulnerability through security updates and patches, requiring organizations to maintain current software versions and implement proper security configuration management practices.