CVE-2025-53791
📋 TL;DR
An improper access control vulnerability in Microsoft Edge allows attackers to bypass security features over a network. This affects users of Microsoft Edge (Chromium-based) who visit malicious websites or interact with compromised network resources.
💻 Affected Systems
- Microsoft Edge (Chromium-based)
📦 What is this software?
Edge Chromium by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Attacker could bypass security features to access restricted content or perform unauthorized actions within the browser context.
Likely Case
Limited information disclosure or minor security feature bypass through crafted network requests.
If Mitigated
No impact if proper network segmentation and browser security settings are configured.
🎯 Exploit Status
Exploitation requires user interaction (visiting malicious site) and specific network conditions.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Microsoft Security Update Guide for specific version
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53791
Restart Required: No
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. Relaunch browser if prompted
🔧 Temporary Workarounds
Enable Enhanced Security Mode
allEnable Edge's Enhanced Security Mode to add additional protections
edge://settings/privacy → Enable Enhanced Security Mode
Network Segmentation
allRestrict browser access to untrusted networks
🧯 If You Can't Patch
- Use alternative browsers for accessing untrusted content
- Implement strict network filtering and web proxy controls
🔍 How to Verify
Check if Vulnerable:
Check Edge version in Settings → About Microsoft Edge and compare with patched versions in Microsoft advisoryCheck Version:
edge://settings/help or edge://versionVerify Fix Applied:
Verify Edge version is updated to patched version and no longer matches vulnerable version range📡 Detection & Monitoring
Log Indicators:
- Unusual network requests from Edge process
- Security feature bypass attempts in browser logs
Network Indicators:
- Suspicious network traffic patterns to/from Edge browser
SIEM Query:
source="edge_logs" AND (event="security_feature_bypass" OR event="unusual_network_request")