CVE-2025-10535
📋 TL;DR
This vulnerability in Firefox for Android's Privacy component allows attackers to bypass privacy protections and access sensitive information that should be restricted. It affects all Firefox for Android users running versions below 143. The issue involves improper handling of privacy controls that could leak user data.
💻 Affected Systems
- Firefox for Android
📦 What is this software?
Firefox by Mozilla
⚠️ Risk & Real-World Impact
Worst Case
Attackers could access sensitive user data including browsing history, saved credentials, or private information that should be protected by Firefox's privacy features.
Likely Case
Malicious websites or apps could bypass privacy restrictions to collect user browsing data and behavior patterns without proper consent.
If Mitigated
With proper browser security settings and updated versions, the risk is limited to potential data leakage from specific privacy bypass scenarios.
🎯 Exploit Status
Exploitation likely requires user interaction (visiting malicious website) but doesn't require authentication. The vulnerability bypasses privacy controls rather than requiring complex exploitation chains.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firefox for Android 143
Vendor Advisory: https://www.mozilla.org/security/advisories/mfsa2025-73/
Restart Required: Yes
Instructions:
1. Open Google Play Store 2. Search for Firefox 3. Check if update to version 143+ is available 4. Tap Update 5. Restart Firefox after update completes
🔧 Temporary Workarounds
Disable JavaScript
androidTemporarily disable JavaScript to reduce attack surface while waiting for update
about:config → javascript.enabled → false
Use Private Browsing Mode
androidPrivate browsing mode may limit data exposure from this vulnerability
Tap menu → New Private Tab
🧯 If You Can't Patch
- Switch to alternative mobile browser until Firefox can be updated
- Avoid visiting untrusted websites and clear browsing data regularly
🔍 How to Verify
Check if Vulnerable:
Open Firefox for Android → Menu → Settings → About Firefox → Check version numberCheck Version:
about:Verify Fix Applied:
Verify Firefox version is 143 or higher in About Firefox settings📡 Detection & Monitoring
Log Indicators:
- Unusual privacy setting changes
- Multiple privacy-related permission requests
Network Indicators:
- Suspicious data exfiltration to unknown domains
- Unexpected cross-origin requests
SIEM Query:
source="firefox_android" AND (event="privacy_violation" OR event="data_leak")