CVE-2025-43357 is a vulnerability identified in Apple iOS and iPadOS operating systems that allows an application to fingerprint the user. Fingerprinting in this context refers to the ability of an app to collect and analyze various pieces of information from the device and user environment to create a unique profile or identifier. This can be used to track users across apps and services without their consent, potentially compromising user privacy. The vulnerability arises from insufficient redaction of sensitive information that apps can access, which was addressed in the updated versions macOS Tahoe 26, iOS 26, and iPadOS 26. While the exact affected versions prior to these updates are unspecified, the issue is significant because it enables apps to bypass typical privacy protections and uniquely identify users, which can lead to privacy violations and targeted tracking. No known exploits are currently reported in the wild, and no CVSS score has been assigned yet. The vulnerability primarily impacts confidentiality by exposing user-identifiable data, but it does not directly affect system integrity or availability. The exploitation does not require elevated privileges but does require the user to install or run a malicious or compromised app on their device. User interaction is therefore necessary, but the attack surface is broad given the widespread use of iOS and iPadOS devices worldwide.

For European organizations, this vulnerability poses a significant privacy risk, especially for those handling sensitive user data or operating apps on iOS/iPadOS platforms. The ability for apps to fingerprint users can undermine compliance with stringent European data protection regulations such as the GDPR, which mandates strict controls on personal data processing and user consent. Organizations that develop or distribute iOS/iPadOS apps may face reputational damage and legal consequences if their apps are exploited to fingerprint users without proper disclosure or consent. Additionally, enterprises relying on iOS/iPadOS devices for employee communications and operations could see increased risk of targeted surveillance or profiling by malicious actors. This could lead to unauthorized data collection, profiling, and potential exploitation of user behavior patterns. The vulnerability does not directly compromise device integrity or availability but can facilitate broader privacy breaches and tracking campaigns that undermine user trust and organizational security postures.

European organizations should prioritize updating all iOS and iPadOS devices to version 26 or later, where the vulnerability has been addressed with improved redaction of sensitive information. App developers should audit their applications to ensure they do not collect or expose unnecessary device or user information that could facilitate fingerprinting. Implementing strict app permissions and minimizing data collection to only what is essential will reduce the risk. Organizations should also educate users about the risks of installing untrusted or unknown apps and encourage the use of official app stores with robust vetting processes. Monitoring app behavior for unusual data access patterns and employing mobile device management (MDM) solutions can help detect and prevent exploitation attempts. Finally, organizations should review their privacy policies and compliance frameworks to ensure they address risks related to fingerprinting and user tracking, aligning with GDPR and other relevant regulations.