CVE-2026-20947
📋 TL;DR
This SQL injection vulnerability in Microsoft Office SharePoint allows authenticated attackers to execute arbitrary SQL commands over the network. Attackers could potentially read, modify, or delete database content, and in some configurations execute code on the underlying server. Organizations using vulnerable SharePoint versions are affected.
💻 Affected Systems
- Microsoft Office SharePoint Server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of SharePoint environment leading to data exfiltration, lateral movement to other systems, and persistent backdoor installation.
Likely Case
Data theft or manipulation of SharePoint content databases, privilege escalation within SharePoint environment.
If Mitigated
Limited impact due to network segmentation, minimal database permissions, and proper input validation at application layer.
🎯 Exploit Status
Requires authenticated access to SharePoint. SQL injection techniques are well understood by attackers.
🛠️ 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-2026-20947
Restart Required: Yes
Instructions:
1. Review Microsoft Security Update Guide for CVE-2026-20947. 2. Download and apply the appropriate security update for your SharePoint version. 3. Restart SharePoint services or server as required.
🔧 Temporary Workarounds
Input Validation Enhancement
windowsImplement additional input validation for SharePoint web parts and forms
Database Permission Reduction
windowsReduce SharePoint database account permissions to minimum required
🧯 If You Can't Patch
- Implement web application firewall (WAF) with SQL injection rules
- Network segmentation to isolate SharePoint servers from critical systems
🔍 How to Verify
Check if Vulnerable:
Check SharePoint version against Microsoft Security Update Guide for CVE-2026-20947Check Version:
Get-SPFarm | Select BuildVersionVerify Fix Applied:
Verify SharePoint version after patch installation matches patched version in advisory📡 Detection & Monitoring
Log Indicators:
- Unusual SQL queries in SharePoint ULS logs
- Multiple failed authentication attempts followed by SQL-like patterns
Network Indicators:
- SQL syntax in HTTP POST parameters to SharePoint endpoints
- Unusual database connections from SharePoint servers
SIEM Query:
source="SharePoint" AND ("sql" OR "select" OR "union" OR "insert" OR "update") AND status=200