CVE-2026-84583 Overview
CVE-2026-84583 is an information disclosure vulnerability affecting multiple Apple operating systems. A local application can read a persistent account identifier due to insufficient permission restrictions. Apple addressed the flaw by adding additional restrictions across its platform lineup, including iOS, iPadOS, macOS, tvOS, visionOS, and watchOS. The weakness is categorized under [CWE-200] Exposure of Sensitive Information to an Unauthorized Actor. Exploitation requires local access and user interaction, but successful abuse enables cross-session or cross-app tracking of a user through a stable identifier that should not be accessible to third-party code.
Critical Impact
A local app installed on an affected Apple device can read a persistent account identifier, enabling covert user tracking and correlation across applications.
Affected Products
- Apple iOS and iPadOS prior to 26.7 and prior to 27
- Apple macOS Sequoia prior to 15.8, macOS Tahoe prior to 26.7, and macOS Golden Gate 27
- Apple tvOS 27, visionOS 27, and watchOS 27
Discovery Timeline
- 2026-09-14 - CVE-2026-84583 published to the National Vulnerability Database
- 2026-09-16 - Last updated in NVD database
Technical Details for CVE-2026-84583
Vulnerability Analysis
The vulnerability resides in the permission model governing access to a persistent account identifier on Apple platforms. A local application running with normal user privileges can query this identifier without the entitlements or user consent that Apple's sandbox model normally requires. Because the identifier does not change across sessions or app installations tied to the same account, it functions as a durable tracking value. Apple's fix introduces additional restrictions on the code path that returns the identifier, narrowing which callers are authorized to receive it.
Root Cause
The root cause is an insufficient authorization check on an interface that returns account-scoped metadata. The interface did not validate that the calling process held the entitlement expected for account identifier access. Any locally installed application could therefore obtain a value intended only for trusted system components.
Attack Vector
Exploitation requires the attacker to deliver a malicious or over-privileged application to a target device, typically through the App Store, TestFlight, enterprise provisioning, or a sideloading path on macOS. Once launched by the user, the app invokes the affected API to retrieve the persistent identifier. No elevated privileges are required, and no additional prompts appear. The identifier can then be exfiltrated to a remote server for user profiling, cross-app correlation, or targeted follow-on operations.
No verified proof-of-concept code is publicly available. See the Apple Support Document #149034 for platform-specific advisory details.
Detection Methods for CVE-2026-84583
Indicators of Compromise
- Applications making unexpected calls to account or identity related system APIs shortly after launch
- Outbound network traffic from third-party apps containing stable, high-entropy identifier strings correlated across devices tied to the same Apple account
- Newly installed apps requesting broad account or identity-adjacent entitlements without a clear functional need
Detection Strategies
- Inventory installed applications on managed Apple endpoints and compare requested entitlements against expected baselines using Mobile Device Management (MDM) reporting
- On macOS, review Unified Log entries and Endpoint Security events for processes accessing account services outside of Apple-signed system binaries
- Correlate application launches with immediate outbound HTTPS connections to known analytics or tracking infrastructure
Monitoring Recommendations
- Enforce MDM policies that report OS build versions and flag devices still on pre-patch releases of iOS, iPadOS, macOS, tvOS, visionOS, and watchOS
- Monitor for anomalous data exfiltration patterns from user endpoints, especially small, repeated payloads that could carry identifiers
- Track app store and enterprise deployment channels for newly published or updated applications targeting managed devices
How to Mitigate CVE-2026-84583
Immediate Actions Required
- Update all Apple devices to iOS 26.7, iPadOS 26.7, iOS 27, iPadOS 27, macOS Sequoia 15.8, macOS Tahoe 26.7, macOS Golden Gate 27, tvOS 27, visionOS 27, or watchOS 27
- Push the updates through MDM with enforced installation deadlines for corporate-owned devices
- Audit installed third-party applications and remove any that are unnecessary or lack a clear business owner
- Remind users to install app updates only from trusted sources and to avoid sideloading unknown binaries on macOS
Patch Information
Apple released fixes across its platform lineup on 2026-09-14. Refer to the vendor advisories for build numbers and platform-specific notes: Apple Support Document #149034, Apple Support Document #149035, Apple Support Document #149036, Apple Support Document #149037, Apple Support Document #149038, Apple Support Document #149041, Apple Support Document #149042, and Apple Support Document #149043.
Workarounds
- No vendor-supplied workaround exists; patching is the only complete remediation
- Restrict application installation on managed devices to a vetted allowlist enforced through MDM
- On macOS, keep Gatekeeper enabled and block execution of unsigned or unnotarized applications through configuration profiles
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
