CVE-2025-53762: Microsoft Purview Privilege Escalation

CVE-2025-53762 Overview

CVE-2025-53762 is a critical privilege escalation vulnerability in Microsoft Purview caused by a permissive list of allowed inputs (CWE-183). This flaw allows an authorized attacker with low privileges to escalate their access over a network, potentially compromising the confidentiality, integrity, and availability of sensitive data governed by the Purview platform.

Microsoft Purview is an enterprise data governance solution used to manage data across on-premises, multi-cloud, and SaaS environments. The vulnerability's network-based attack vector and scope change capability make it particularly dangerous in enterprise environments where Purview manages sensitive compliance and data classification workflows.

Critical Impact

An authenticated attacker can exploit permissive input validation to elevate privileges across network boundaries, potentially gaining unauthorized access to sensitive data governance controls and compliance information managed by Microsoft Purview.

Affected Products

• Microsoft Purview

Discovery Timeline

• 2025-07-18 - CVE-2025-53762 published to NVD
• 2025-08-14 - Last updated in NVD database

Technical Details for CVE-2025-53762

Vulnerability Analysis

This vulnerability stems from CWE-183: Permissive List of Allowed Inputs, indicating that the affected component fails to properly restrict the set of acceptable input values. When an application maintains an allowlist that is overly permissive, attackers can supply inputs that bypass security controls while still being technically "allowed" by the validation logic.

In the context of Microsoft Purview, this weakness enables authenticated users to craft specific inputs that the system incorrectly accepts, leading to privilege escalation. The scope change indicator in the vulnerability assessment suggests that a successful exploit can affect resources beyond the vulnerable component's security boundary, potentially impacting other systems or data stores connected to Purview.

The network-based attack vector with low attack complexity and no user interaction requirement means that an attacker with valid but low-privileged credentials can remotely exploit this vulnerability without any additional prerequisites.

Root Cause

The root cause is an insufficiently restrictive input validation mechanism that uses a permissive allowlist approach. Rather than implementing strict input validation with explicit allow rules for only the minimal required inputs, the affected component accepts a broader range of values than intended. This permissive validation allows attackers to inject inputs that elevate their privilege level within the application context.

Attack Vector

The attack is conducted over the network and requires the attacker to have low-level authenticated access to the Microsoft Purview environment. The exploitation flow involves:

1. An attacker authenticates to Microsoft Purview with low-privileged credentials
2. The attacker identifies input fields or API endpoints that utilize the vulnerable allowlist validation
3. Specially crafted inputs are submitted that satisfy the permissive allowlist but abuse the system's trust model
4. The system processes these inputs and grants elevated privileges to the attacker
5. With escalated privileges, the attacker can access sensitive data governance controls, modify compliance policies, or exfiltrate protected information

The vulnerability does not require user interaction and can be exploited with low attack complexity, making it highly actionable for threat actors with initial access.

Detection Methods for CVE-2025-53762

Indicators of Compromise

• Unexpected privilege elevation events for low-privileged user accounts within Microsoft Purview
• Anomalous API calls or input patterns that deviate from normal user behavior
• Audit log entries showing access to restricted data governance functions by unauthorized users
• Unusual modifications to compliance policies or data classification rules

Detection Strategies

• Monitor Microsoft Purview audit logs for privilege escalation events and role changes
• Implement behavioral analysis to detect users accessing resources beyond their normal scope
• Deploy network traffic analysis to identify suspicious API request patterns to Purview endpoints
• Configure alerts for failed and successful authentication attempts followed by elevated operations

Monitoring Recommendations

• Enable comprehensive audit logging in Microsoft Purview and forward logs to your SIEM
• Establish baseline user behavior profiles and alert on deviations in access patterns
• Monitor for changes to data governance policies and classification rules by non-administrative accounts
• Integrate Microsoft Purview telemetry with SentinelOne Singularity for unified threat detection

How to Mitigate CVE-2025-53762

Immediate Actions Required

• Apply the latest Microsoft security updates for Microsoft Purview immediately
• Review and audit current user privileges within Purview to ensure least-privilege principles
• Monitor for any suspicious activity in Purview audit logs dating back to potential exposure window
• Implement network segmentation to limit lateral movement if exploitation occurs

Patch Information

Microsoft has released a security update to address this vulnerability. Organizations should apply the patch as soon as possible through their standard update mechanisms. Detailed patch information and deployment guidance is available in the Microsoft Security Update for CVE-2025-53762.

Workarounds

• Restrict network access to Microsoft Purview to only authorized administrative networks
• Implement additional authentication controls such as MFA for all Purview access
• Review and tighten existing user role assignments to minimize the number of users with elevated privileges
• Consider temporarily restricting access to non-essential Purview features until patching is complete

# Review current user privileges in your environment
# Audit user role assignments in Microsoft Purview via Azure CLI
az purview account list --output table

# Enable enhanced diagnostic logging for monitoring
az monitor diagnostic-settings create \
  --name "PurviewSecurityAudit" \
  --resource-group <your-resource-group> \
  --resource <purview-account-name> \
  --resource-type "Microsoft.Purview/accounts" \
  --logs '[{"category": "ScanStatusLogEvent", "enabled": true}]'