External risk intelligence

Apple Operating Systems Permissions Flaw Allows User Fingerprinting

CVE advisorySeverity: CRITICAL (CVSS 9.1)

CVE-2026-84625

The vulnerability affects client-side operating systems and requires an app to be running locally on the device to perform fingerprinting. It is not a network-exposed service, gateway, or internet-facing infrastructure component.

Information Disclosure

Apple Ipados

before 27.0

Halo Surface Signal: 1 out of 5 — much less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A permissions issue has been identified across multiple Apple operating systems, including iOS, iPadOS, macOS, visionOS, and watchOS. This vulnerability could allow an application to gather information to identify a user. The primary concern is confirming if this issue is relevant to our environment and if any affected systems are exposed.

An app could identify users on Apple devices.
Critical issue for user privacy and data protection.
Confirm relevance and exposure for affected Apple systems.

Attack Path

How an attacker could exploit the issue

An attacker could leverage this vulnerability by creating an app that, once installed on a user's device, may be able to gather information to identify the user. This is possible because of insufficient sandbox restrictions, which allow the app to potentially gain unauthorized access to user data. This could lead to significant privacy concerns and compromise user identity.

An app must be installed on the device.
The app triggers the vulnerability.
Risk of user fingerprinting and privacy loss.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an app to collect identifying information about the user, a practice known as fingerprinting. This may occur when an application is running on the affected operating system and exploits sandbox restrictions to gather unique system or user data.

User or system identifying data at risk.
App may collect data when running.
Potential for user tracking or profiling.

Operational Fix

Recommended remediation, mitigation, and detection steps

The affected operating systems are managed by device owners or IT administrators, with potential oversight from mobile device management (MDM) or endpoint security teams. The first practical step is to identify all devices running these operating systems, assess their exposure and criticality, and then coordinate with asset owners to plan the update process.

Device owners and IT administrators
Verify all affected devices are identified.
Plan and deploy OS updates.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is the software affected by CVE-2026-84625?

This CVE impacts the core operating systems from Apple, including iOS, iPadOS, macOS, visionOS, and watchOS. These platforms power billions of personal and professional devices, handling everything from daily communications and media consumption to sensitive enterprise workflows. The vulnerability exists within the foundational software that manages how these devices interact with hardware and user data.

How does this vulnerability allow user fingerprinting?

CVE-2026-84625 is classified as CWE-200, which involves the exposure of sensitive information. In this case, insufficient sandbox restrictions fail to properly isolate applications. Because the sandbox is too permissive, a malicious or poorly designed app can reach outside its authorized area to collect unique system identifiers. By harvesting these specific data points, the app creates a digital profile that can track or identify the user across different sessions.

Do I need to be worried about network-based attacks?

No. This vulnerability is not triggered by a remote attacker scanning your network or sending malicious traffic to your device. It requires an application to be physically installed and running locally on the Apple device. Simply browsing the web or being connected to the internet does not trigger this flaw; the code must be executing within the device's own operating environment to bypass the sandbox restrictions.

Why does Halo Surface Signal categorize this as low relevance?

Halo Surface Signal notes that while the severity is high, the threat is unlikely because this is a client-side OS issue rather than an internet-facing infrastructure component. Because the flaw requires an app to be active on a local device to perform fingerprinting, it does not present the same immediate risk as a vulnerable network gateway or public-facing server that can be attacked remotely without user interaction.

How should I manage my devices for this vulnerability?

The practical response is to verify that your fleet of Apple devices is updated to the latest versions released by the manufacturer. Since the fix involves patching the underlying operating system to enforce stricter sandbox boundaries, you should coordinate with your IT or mobile device management teams to deploy the version 27 updates across all company-managed iPhones, iPads, Macs, and other affected Apple hardware as soon as possible.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.