CVE-2025-64676 Overview
CVE-2025-64676 is a path traversal vulnerability in Microsoft Purview that allows an authorized attacker to execute code over a network. The flaw involves improper handling of path sequences such as .../...//, which bypass canonicalization routines and reach unintended file system locations. Microsoft published the advisory on December 18, 2025, and classified the issue under CWE-35: Path Traversal: '.../...//'. Successful exploitation results in code execution within the Purview environment, with high impact to confidentiality, integrity, and availability. The vulnerability requires high privileges but no user interaction, making it a meaningful risk in environments where Purview accounts are broadly delegated.
Critical Impact
An authenticated attacker with elevated privileges can execute arbitrary code over the network against Microsoft Purview, compromising data governance and potentially exposing regulated content.
Affected Products
- Microsoft Purview
- Microsoft Purview data governance services exposing the vulnerable path-handling component
- Tenants where privileged Purview roles are delegated to multiple administrators
Discovery Timeline
- 2025-12-18 - CVE-2025-64676 published to NVD
- 2026-02-10 - Last updated in NVD database
Technical Details for CVE-2025-64676
Vulnerability Analysis
The vulnerability is a path traversal flaw mapped to CWE-35, which specifically describes the .../...// traversal pattern. This pattern defeats naive sanitizers that strip a single ../ sequence, because removing the inner ../ leaves a residual ../ that still traverses upward. When Microsoft Purview processes a crafted path containing this sequence, the resolved location escapes the intended directory boundary. The attacker can then write or invoke files in locations that lead to code execution within the service context. The attack is network-reachable and requires no user interaction, but the attacker must already hold high privileges in the target tenant.
Root Cause
The root cause is improper limitation of a pathname to a restricted directory. Purview's input handling fails to fully canonicalize traversal sequences before using them in file operations. Specifically, the .../...// token is not normalized to a single traversal, allowing the resolved path to break out of the intended directory tree.
Attack Vector
Exploitation requires network access to the Purview service and a valid account with elevated permissions. The attacker submits a request containing the crafted .../...// sequence within a path parameter consumed by Purview. The service resolves the sequence to a location outside the intended scope and processes the attacker-controlled content, leading to code execution. No user interaction is required, and the scope remains unchanged.
No public proof-of-concept code has been released for CVE-2025-64676. See the Microsoft CVE-2025-64676 Advisory for technical details from the vendor.
Detection Methods for CVE-2025-64676
Indicators of Compromise
- Requests to Microsoft Purview endpoints containing the literal sequence .../...// or URL-encoded variants such as %2E%2E%2E%2F%2E%2E%2E%2F%2F
- Purview audit log entries showing privileged account activity accessing unexpected file paths
- Unexpected process execution or file writes originating from Purview service identities
- Sign-ins by privileged Purview administrators from atypical IP addresses or geographies preceding the suspicious requests
Detection Strategies
- Inspect HTTP request bodies and query strings sent to Purview management APIs for traversal patterns, including encoded forms
- Correlate privileged role usage in Microsoft Purview with subsequent anomalous file or process activity
- Alert on Purview API calls that deviate from baseline behavior for each administrator account
Monitoring Recommendations
- Forward Microsoft Purview audit logs and Entra ID sign-in logs to a centralized analytics platform for correlation
- Monitor for privilege changes that grant Purview administrator roles, especially to service principals
- Track outbound network connections from Purview-integrated infrastructure to identify post-exploitation activity
How to Mitigate CVE-2025-64676
Immediate Actions Required
- Apply the Microsoft update referenced in the Microsoft CVE-2025-64676 Advisory as soon as it is available in your tenant
- Audit all accounts holding privileged Microsoft Purview roles and remove unnecessary assignments
- Require phishing-resistant multi-factor authentication for every account with Purview administrator privileges
- Review Purview audit logs for traversal patterns or unexpected privileged activity over the past 90 days
Patch Information
Microsoft addresses CVE-2025-64676 through service-side updates to Microsoft Purview. Because Purview is a cloud service, Microsoft deploys the fix directly. Customers should confirm remediation status through the Microsoft CVE-2025-64676 Advisory and validate that no follow-up tenant actions are required.
Workarounds
- Restrict Purview administrative role membership to a minimal set of accounts protected by conditional access policies
- Enforce network-level controls limiting which IP ranges can reach Purview management endpoints
- Enable just-in-time elevation for Purview administrator roles through Privileged Identity Management to reduce the window of exposure
# Example: review privileged Purview role assignments via Microsoft Graph PowerShell
Connect-MgGraph -Scopes "RoleManagement.Read.Directory"
Get-MgRoleManagementDirectoryRoleAssignment -Filter "roleDefinitionId eq '<purview-admin-role-id>'" |
Select-Object PrincipalId, DirectoryScopeId, RoleDefinitionId
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
