CVE-2025-10535 is a vulnerability identified in the Privacy component of Mozilla Firefox for Android, affecting versions prior to 143. The issue is categorized under CWE-200, indicating an information disclosure weakness. Specifically, this vulnerability allows an attacker to bypass privacy mitigations designed to protect sensitive user data. The CVSS v3.1 base score is 7.5, reflecting a high severity level. The vector string (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N) indicates that the attack can be performed remotely over the network without any privileges or user interaction, and it impacts the integrity of data but not confidentiality or availability. However, the description states information disclosure, which suggests confidentiality impact; this discrepancy may be due to the CVSS vector focusing on integrity impact. The vulnerability is present in Firefox for Android, a widely used mobile browser, and could allow attackers to access or manipulate sensitive information that should be protected by privacy controls. No patches or exploit code are currently publicly available, but the vulnerability is published and should be addressed promptly. The lack of user interaction and privileges required makes this vulnerability particularly dangerous, as it can be exploited at scale if weaponized. The mitigation bypass aspect implies that existing privacy protections can be circumvented, increasing the risk of data leakage or unauthorized data access.

For European organizations, this vulnerability poses a significant risk to the confidentiality of sensitive information accessed or processed via Firefox on Android devices. Organizations in sectors such as finance, healthcare, and government, which handle regulated or sensitive data, could be particularly vulnerable to data leakage or privacy breaches. The ability to exploit this vulnerability remotely without user interaction increases the attack surface, especially in environments where employees use Firefox on Android for work-related browsing or accessing corporate resources. This could lead to unauthorized disclosure of internal information, user credentials, or session data, potentially facilitating further attacks such as identity theft or corporate espionage. Additionally, regulatory compliance frameworks like GDPR impose strict requirements on data protection; exploitation of this vulnerability could result in non-compliance penalties. The absence of known exploits in the wild currently provides a window for proactive mitigation, but the high severity score necessitates urgent attention to prevent future exploitation.

1. Update Firefox for Android to version 143 or later as soon as the patch is released by Mozilla to eliminate the vulnerability. 2. Until patches are available, restrict or monitor Firefox usage on Android devices within the organization, especially for accessing sensitive systems or data. 3. Implement network-level intrusion detection and prevention systems (IDS/IPS) to detect anomalous traffic patterns that may indicate exploitation attempts targeting Firefox clients. 4. Employ mobile device management (MDM) solutions to enforce browser update policies and restrict installation of vulnerable app versions. 5. Educate users about the risks of using outdated browsers and encourage prompt updates. 6. Review and tighten privacy settings within Firefox to minimize data exposure and disable features that may be exploited. 7. Monitor security advisories from Mozilla and threat intelligence feeds for any emerging exploit information related to this CVE. 8. Conduct regular security assessments and penetration tests focusing on mobile browser security to identify and remediate related weaknesses.