CVE-2025-14323
📋 TL;DR
This CVE describes a privilege escalation vulnerability in the DOM Notifications component of Mozilla products. It allows attackers to elevate privileges within the browser context, potentially executing arbitrary code with higher permissions. Affected users include those running vulnerable versions of Firefox, Firefox ESR, and Thunderbird.
💻 Affected Systems
- Firefox
- Firefox ESR
- Thunderbird
📦 What is this software?
Firefox by Mozilla
Firefox by Mozilla
Firefox by Mozilla
Thunderbird by Mozilla
Thunderbird by Mozilla
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise via arbitrary code execution with elevated privileges, potentially leading to data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Limited privilege escalation within the browser sandbox allowing unauthorized access to browser data, session hijacking, or installation of malicious extensions.
If Mitigated
Minimal impact if browser sandboxing works as intended, with only limited privilege elevation within the browser context.
🎯 Exploit Status
Exploitation requires user interaction (visiting malicious website or opening malicious email in Thunderbird).
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firefox 146+, Firefox ESR 115.31+, Firefox ESR 140.6+, Thunderbird 146+, Thunderbird 140.6+
Vendor Advisory: https://www.mozilla.org/security/advisories/
Restart Required: Yes
Instructions:
1. Open browser/Thunderbird. 2. Click menu → Help → About Firefox/Thunderbird. 3. Allow automatic update to complete. 4. Restart when prompted.
🔧 Temporary Workarounds
Disable JavaScript
allTemporarily disable JavaScript to prevent exploitation via malicious websites
about:config → javascript.enabled = false
Disable Notifications
allDisable browser notifications to mitigate the vulnerable component
about:preferences → Privacy & Security → Permissions → Notifications → Settings → Block new requests
🧯 If You Can't Patch
- Restrict browser usage to trusted websites only
- Implement application whitelisting to prevent unauthorized browser execution
🔍 How to Verify
Check if Vulnerable:
Check browser version in About dialog and compare against affected versionsCheck Version:
firefox --version or thunderbird --versionVerify Fix Applied:
Verify version is equal to or greater than patched versions listed📡 Detection & Monitoring
Log Indicators:
- Unusual privilege escalation events in browser logs
- Multiple notification permission requests from single site
Network Indicators:
- Traffic to known malicious domains hosting exploit code
- Unexpected outbound connections after visiting websites
SIEM Query:
source="browser_logs" AND (event="privilege_escalation" OR event="notification_exploit")🔗 References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1996555
- https://www.mozilla.org/security/advisories/mfsa2025-92/
- https://www.mozilla.org/security/advisories/mfsa2025-93/
- https://www.mozilla.org/security/advisories/mfsa2025-94/
- https://www.mozilla.org/security/advisories/mfsa2025-95/
- https://www.mozilla.org/security/advisories/mfsa2025-96/
