CVE-2024-4766 in Firefox
Summary
by MITRE • 05/14/2024
Different techniques existed to obscure the fullscreen notification in Firefox for Android. These could have lead to potential user confusion and spoofing attacks. *This bug only affects Firefox for Android. Other versions of Firefox are unaffected.* This vulnerability affects Firefox < 126.
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Analysis
by VulDB Data Team • 03/30/2025
This vulnerability in Firefox for Android represents a significant user interface security flaw that could enable malicious actors to deceive users through deceptive notifications. The issue stems from insufficient safeguards that allow various techniques to obscure or manipulate fullscreen notifications, creating opportunities for phishing and spoofing attacks. The vulnerability specifically impacts Firefox versions prior to 126, leaving users exposed to potential social engineering attacks that exploit the notification system's weaknesses. This flaw demonstrates how mobile browser security can be compromised through seemingly minor interface elements that are critical for user trust and security awareness.
The technical nature of this vulnerability lies in the browser's notification handling system where multiple methods can be employed to hide or manipulate fullscreen alerts. Attackers could potentially use these techniques to create misleading notifications that appear legitimate while concealing malicious content or redirecting users to harmful websites. The vulnerability's impact extends beyond simple user confusion as it creates a trust boundary violation in the browser's security model. According to CWE classification, this relates to CWE-611 Insufficient Protection of Web Content, and aligns with ATT&CK technique T1566.002 Phishing via Social Media, as it enables more sophisticated social engineering attacks. The vulnerability essentially undermines the user's ability to distinguish between legitimate browser notifications and potentially malicious ones.
The operational impact of this vulnerability is particularly concerning for mobile users who rely heavily on browser notifications for security alerts and important communications. Users may be tricked into interacting with notifications that appear genuine but contain malicious links or content, potentially leading to credential theft, malware installation, or financial fraud. The attack surface is broadened as the vulnerability affects the core notification system that users trust to provide accurate security information. Security researchers have identified that this weakness creates a persistent threat vector that could be exploited across various malicious campaigns, particularly those targeting mobile users who are often less vigilant about notification authenticity compared to desktop users.
Mitigation strategies should focus on immediate browser updates to version 126 or later where the vulnerability has been addressed. Users should also be educated about the importance of verifying notification sources and being cautious when interacting with fullscreen alerts. Organizations deploying Firefox for Android should implement additional monitoring to detect unusual notification patterns that might indicate exploitation attempts. Security teams should consider implementing network-level controls to block known malicious domains that might be accessed through spoofed notifications. The vulnerability highlights the importance of maintaining up-to-date mobile browser security and demonstrates how interface-level weaknesses can create significant security risks. Regular security assessments of mobile browser notification systems should be conducted to identify similar vulnerabilities that could compromise user security.