CVE-2025-29807
📋 TL;DR
This vulnerability allows an authorized attacker to execute arbitrary code on Microsoft Dataverse servers by exploiting insecure deserialization of untrusted data. Organizations using Microsoft Dataverse with default configurations are affected, particularly those with internet-facing instances or insufficient network segmentation.
💻 Affected Systems
- Microsoft Dataverse
📦 What is this software?
Dataverse by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Full remote code execution leading to complete system compromise, data exfiltration, and lateral movement within the network.
Likely Case
Unauthorized code execution with the privileges of the Dataverse service account, potentially allowing data access and further exploitation.
If Mitigated
Attack blocked at network perimeter or by application controls, with only failed exploitation attempts logged.
🎯 Exploit Status
Exploitation requires authorized access to Dataverse; no public exploit code available as of current information.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Microsoft Security Update Guide for specific patch versions
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-29807
Restart Required: No
Instructions:
1. Review Microsoft Security Update Guide for CVE-2025-29807. 2. Apply the latest security updates for Microsoft Dataverse. 3. Verify patch installation through version checks.
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to Dataverse instances to only trusted sources.
Principle of Least Privilege
allMinimize authorized user accounts and permissions for Dataverse access.
🧯 If You Can't Patch
- Implement strict network access controls to limit Dataverse exposure
- Monitor for suspicious deserialization attempts in application logs
🔍 How to Verify
Check if Vulnerable:
Check Dataverse version against Microsoft's patched versions in the advisory.Check Version:
Check through Microsoft Dataverse admin portal or PowerShell: Get-DataverseVersion (if available)Verify Fix Applied:
Confirm Dataverse version matches or exceeds the patched version specified by Microsoft.📡 Detection & Monitoring
Log Indicators:
- Unusual deserialization errors in Dataverse logs
- Suspicious process execution from Dataverse service account
Network Indicators:
- Unexpected outbound connections from Dataverse servers
- Anomalous network traffic patterns to/from Dataverse
SIEM Query:
source="dataverse" AND (event_type="deserialization_error" OR process_execution="unusual")