CVE-2025-60726
📋 TL;DR
This vulnerability is an out-of-bounds read flaw in Microsoft Excel that allows an attacker to read memory contents they shouldn't have access to. Attackers could exploit this by tricking users into opening a malicious Excel file, potentially exposing sensitive information. All users running vulnerable versions of Microsoft Excel are affected.
💻 Affected Systems
- Microsoft Excel
📦 What is this software?
365 Apps by Microsoft
365 Apps by Microsoft
Excel by Microsoft
Excel by Microsoft
Office by Microsoft
Office by Microsoft
Office Long Term Servicing Channel by Microsoft
View all CVEs affecting Office Long Term Servicing Channel →
Office Long Term Servicing Channel by Microsoft
View all CVEs affecting Office Long Term Servicing Channel →
Office Long Term Servicing Channel by Microsoft
View all CVEs affecting Office Long Term Servicing Channel →
Office Long Term Servicing Channel by Microsoft
View all CVEs affecting Office Long Term Servicing Channel →
Office Long Term Servicing Channel by Microsoft
View all CVEs affecting Office Long Term Servicing Channel →
⚠️ Risk & Real-World Impact
Worst Case
An attacker could read sensitive data from memory, potentially exposing passwords, encryption keys, or other confidential information stored in Excel's memory space.
Likely Case
Information disclosure of random memory contents, which could include fragments of sensitive data or application state information.
If Mitigated
Limited impact with proper security controls like application sandboxing, memory protection mechanisms, and restricted user privileges.
🎯 Exploit Status
Requires user to open malicious Excel file; information disclosure only, not code execution
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Latest security updates from Microsoft
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-60726
Restart Required: Yes
Instructions:
1. Open Excel > File > Account > Update Options > Update Now. 2. For enterprise: Deploy Microsoft security updates via WSUS, SCCM, or Intune. 3. Verify update installation in Windows Update history.
🔧 Temporary Workarounds
Disable Excel file opening
windowsPrevent Excel from opening files from untrusted sources
Not applicable - configure via Group Policy or registry
Use Protected View
windowsForce all Excel files to open in Protected View
File > Options > Trust Center > Trust Center Settings > Protected View > Check all options
🧯 If You Can't Patch
- Restrict Excel file opening to trusted sources only
- Implement application whitelisting to prevent unauthorized Excel execution
🔍 How to Verify
Check if Vulnerable:
Check Excel version against patched versions in Microsoft advisoryCheck Version:
Excel: File > Account > About Excel (Windows) or Excel > About Excel (macOS)Verify Fix Applied:
Verify Excel version matches or exceeds patched version in Microsoft security update📡 Detection & Monitoring
Log Indicators:
- Excel crash logs with memory access violations
- Windows Event Logs: Application errors from EXCEL.EXE
Network Indicators:
- Unusual Excel file downloads from external sources
- Phishing emails with Excel attachments
SIEM Query:
source="*excel*" AND (error OR crash OR "access violation")