CVE-2025-21253
📋 TL;DR
Microsoft Edge for iOS and Android contains a spoofing vulnerability that could allow an attacker to display misleading content in the browser interface. This affects users of Microsoft Edge mobile apps on iOS and Android devices. The vulnerability could trick users into interacting with malicious content.
💻 Affected Systems
- Microsoft Edge for iOS
- Microsoft Edge for Android
📦 What is this software?
Edge by Microsoft
Edge by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
An attacker could create convincing phishing pages that appear legitimate, potentially leading to credential theft, financial fraud, or malware installation.
Likely Case
Users could be tricked into clicking malicious links or providing sensitive information through spoofed interface elements.
If Mitigated
With proper user awareness and security controls, the impact is limited to potential confusion or minor inconvenience.
🎯 Exploit Status
As a spoofing vulnerability, exploitation typically requires user interaction but doesn't require authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Microsoft Edge app store updates for latest version
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21253
Restart Required: No
Instructions:
1. Open your device's app store (Apple App Store or Google Play Store)
2. Search for Microsoft Edge
3. Tap 'Update' if available
4. Launch Microsoft Edge after update completes
🔧 Temporary Workarounds
Use alternative browser
allTemporarily use a different mobile browser until Microsoft Edge is updated
Disable automatic URL loading
allConfigure browser to prompt before loading URLs from untrusted sources
🧯 If You Can't Patch
- Educate users about phishing risks and browser spoofing techniques
- Implement mobile device management (MDM) policies to restrict browser usage
🔍 How to Verify
Check if Vulnerable:
Check Microsoft Edge version in app settings and compare against latest version in app storeCheck Version:
Open Microsoft Edge → Settings → About Microsoft EdgeVerify Fix Applied:
Confirm Microsoft Edge is updated to latest version from official app store📡 Detection & Monitoring
Log Indicators:
- Unusual browser activity patterns
- Multiple failed authentication attempts from mobile devices
Network Indicators:
- Traffic to known phishing domains from mobile browsers
- Unusual redirect patterns in HTTP logs
SIEM Query:
Search for user reports of suspicious browser behavior or phishing attempts on mobile devices