CVE-2025-27425
📋 TL;DR
This vulnerability in Firefox for iOS allows QR codes containing website URLs to open those URLs automatically without user confirmation. It affects Firefox for iOS users running versions below 136, potentially exposing them to malicious websites without their knowledge.
💻 Affected Systems
- Firefox for iOS
📦 What is this software?
Firefox by Mozilla
⚠️ Risk & Real-World Impact
Worst Case
Users could be redirected to phishing sites, malware distribution pages, or credential harvesting sites without any warning or consent.
Likely Case
Users scanning QR codes from untrusted sources could be taken to unwanted or malicious websites, potentially leading to phishing attempts or unwanted tracking.
If Mitigated
With proper user awareness and updated software, the risk is minimal as users would receive confirmation prompts before URL navigation.
🎯 Exploit Status
Exploitation requires the user to scan a malicious QR code, making it dependent on social engineering.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firefox for iOS 136 and later
Vendor Advisory: https://www.mozilla.org/security/advisories/mfsa2025-13/
Restart Required: No
Instructions:
1. Open the App Store on your iOS device. 2. Search for Firefox. 3. Tap 'Update' next to Firefox. 4. Wait for the update to complete. 5. Launch Firefox to verify the update.
🔧 Temporary Workarounds
Disable QR code scanning in Firefox
iosPrevent Firefox from automatically scanning QR codes by disabling the feature
Use alternative QR scanner
iosUse iOS Camera or a dedicated QR scanner app instead of Firefox's built-in scanner
🧯 If You Can't Patch
- Avoid scanning QR codes with Firefox for iOS until patched
- Use alternative browsers for QR code scanning functionality
🔍 How to Verify
Check if Vulnerable:
Check Firefox version in Settings > About Firefox. If version is below 136, you are vulnerable.Check Version:
Open Firefox for iOS, go to Settings > About Firefox to view versionVerify Fix Applied:
After updating, verify version is 136 or higher in Settings > About Firefox.📡 Detection & Monitoring
Log Indicators:
- Unexpected URL navigations without user interaction logs
- QR code scan events followed by immediate URL loading
Network Indicators:
- Unexpected connections to domains from QR code scans without user confirmation
SIEM Query:
Not applicable for mobile browser vulnerabilities on personal devices