CVE-2026-16373 in Firefox
Summary
by MITRE • 07/21/2026
Information disclosure in the Privacy component in Firefox for Android. This vulnerability was fixed in Firefox 153.
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Analysis
by VulDB Data Team • 07/21/2026
This vulnerability represents an information disclosure issue within the privacy component of Firefox for Android, a critical security flaw that could potentially expose sensitive user data to unauthorized parties. The weakness specifically affects the mobile browser implementation and stems from inadequate handling of privacy-related data structures or processes within the application's codebase. Such information disclosure vulnerabilities typically occur when applications fail to properly sanitize or restrict access to confidential data, creating potential attack vectors for malicious actors seeking to extract personal information.
The technical nature of this flaw suggests that Firefox for Android was not adequately protecting user privacy settings, session data, or other sensitive information that should remain isolated from potentially malicious processes or unauthorized access attempts. This type of vulnerability aligns with common security weaknesses documented in the CWE database under categories related to information exposure and improper information handling within web browsers. The issue likely manifested through mechanisms such as insecure data storage practices, inadequate access controls, or flawed privacy boundary implementations that allowed unauthorized data retrieval.
From an operational perspective, this vulnerability creates significant risks for Firefox users who rely on the mobile browser for sensitive activities including financial transactions, personal communications, or confidential work-related tasks. Attackers could potentially exploit this weakness to access browsing history, cached credentials, session tokens, or other privacy-sensitive information stored within the application's memory or storage systems. The impact extends beyond individual user privacy concerns to potential corporate data breaches when users access company resources through the vulnerable browser implementation. This issue particularly affects mobile environments where applications may have more limited security boundaries compared to desktop implementations.
The remediation approach for this vulnerability involved implementing proper access controls and data sanitization mechanisms within Firefox's privacy component specifically designed for Android platforms. Security updates typically address such issues by strengthening input validation processes, implementing stricter data isolation protocols, and ensuring that privacy-related information is properly secured through appropriate cryptographic measures or access restriction controls. Organizations should prioritize updating to Firefox version 153 or later to mitigate this risk, as the fix likely incorporated enhanced privacy boundary enforcement and improved information flow controls that align with industry best practices for mobile browser security.
This vulnerability type demonstrates the ongoing challenges in maintaining robust privacy protections within complex web browser implementations, particularly when transitioning between desktop and mobile platforms. The fix represents a standard security patching approach that addresses known weaknesses in information handling processes, similar to patterns found in ATT&CK framework techniques related to credential access and information gathering. Mobile browser security remains a critical area of focus due to the unique threat landscape and limited security controls inherent in mobile operating systems, making regular updates and proper vulnerability management essential for maintaining user privacy protections.