CVE-2025-49741
📋 TL;DR
This vulnerability in Microsoft Edge (Chromium-based) allows unauthorized attackers to access sensitive information over a network. It affects all users running vulnerable versions of Microsoft Edge, potentially exposing private data to remote attackers.
💻 Affected Systems
- Microsoft Edge (Chromium-based)
📦 What is this software?
Edge Chromium by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Attackers could exfiltrate sensitive user data, session tokens, or authentication credentials from vulnerable Edge instances, leading to account compromise and data breaches.
Likely Case
Information disclosure of browser data, potentially including cached credentials, browsing history, or session information to network-based attackers.
If Mitigated
Limited impact with proper network segmentation and browser security controls, though information disclosure risk remains.
🎯 Exploit Status
CWE-268 indicates privilege context switching issue, suggesting exploitation may require specific conditions but is network-based.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Microsoft Security Update Guide for specific version
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-49741
Restart Required: Yes
Instructions:
1. Open Microsoft Edge
2. Click Settings (three dots) → Help and feedback → About Microsoft Edge
3. Allow browser to check for and install updates
4. Restart Edge when prompted
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to Edge instances, especially from untrusted networks
Browser Isolation
allUse browser isolation solutions to contain potential data exfiltration
🧯 If You Can't Patch
- Disable Microsoft Edge usage for sensitive browsing tasks
- Implement strict network access controls and monitoring for Edge traffic
🔍 How to Verify
Check if Vulnerable:
Check Edge version in Settings → About Microsoft Edge and compare against patched versions in Microsoft advisoryCheck Version:
On Windows: edge://version/ or Settings → About Microsoft EdgeVerify Fix Applied:
Confirm Edge version is updated to patched version and no longer matches vulnerable version range📡 Detection & Monitoring
Log Indicators:
- Unusual network connections from Edge process
- Suspicious data transfer patterns from browser
Network Indicators:
- Anomalous outbound connections from Edge instances
- Unexpected data exfiltration patterns
SIEM Query:
source="edge" AND (event_type="network_connection" OR event_type="process_creation") AND dest_ip NOT IN (trusted_networks)