CVE-2025-53728
📋 TL;DR
This vulnerability in Microsoft Dynamics 365 (on-premises) allows unauthorized attackers to access sensitive information over the network. Attackers can exploit this to disclose confidential data stored in Dynamics 365. Organizations running on-premises Dynamics 365 deployments are affected.
💻 Affected Systems
- Microsoft Dynamics 365 (on-premises)
📦 What is this software?
Dynamics 365 by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete exposure of sensitive business data, customer information, financial records, or intellectual property stored in Dynamics 365 to unauthorized external actors.
Likely Case
Partial disclosure of sensitive information such as customer data, business operations details, or configuration information that could enable further attacks.
If Mitigated
Limited information disclosure with minimal business impact due to proper network segmentation and access controls.
🎯 Exploit Status
Exploitation requires network access to the Dynamics 365 server but no authentication. Attackers need to craft specific requests to trigger the information disclosure.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Microsoft's monthly security updates for Dynamics 365
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53728
Restart Required: No
Instructions:
1. Apply the latest security update from Microsoft for Dynamics 365 (on-premises). 2. Follow Microsoft's specific patching guidance for your Dynamics 365 version. 3. Test the patch in a non-production environment first.
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to Dynamics 365 servers to only authorized users and systems
Access Control Lists
allImplement strict firewall rules to limit which IP addresses can communicate with Dynamics 365
🧯 If You Can't Patch
- Implement strict network segmentation and firewall rules to isolate Dynamics 365 servers
- Monitor all network traffic to Dynamics 365 servers for suspicious access patterns
🔍 How to Verify
Check if Vulnerable:
Check your Dynamics 365 version against Microsoft's security advisory and verify if unpatchedCheck Version:
Check Dynamics 365 version through administration console or PowerShell: Get-Command -Module Microsoft.Dynamics*Verify Fix Applied:
Verify the security update is installed and test that information disclosure no longer occurs📡 Detection & Monitoring
Log Indicators:
- Unusual access patterns to Dynamics 365
- Failed authentication attempts followed by information requests
- Requests for sensitive endpoints from unauthorized sources
Network Indicators:
- Unusual data egress from Dynamics 365 servers
- Traffic patterns indicating information gathering
SIEM Query:
source="dynamics365" AND (event_type="sensitive_access" OR data_size>threshold) AND src_ip NOT IN (authorized_ips)