CVE-2026-86989 in iOS
Summary
by MITRE • 10/26/2026
An authorization issue was addressed with improved state management. This issue is fixed in iOS 26.7.2 and iPadOS 26.7.2, iOS 27.2 and iPadOS 27.2. An app may be able to fingerprint the user.
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Analysis
by VulDB Data Team • 10/26/2026
The vulnerability described involves a flaw in state management within Apple's operating systems for iPhone and iPad, specifically affecting versions prior to iOS/iPadOS 26.7.2 and 27.2. This issue is categorized as an authorization problem where improper handling of application states allows external entities or malicious applications to gather information about the user that they should not have access to. The core technical flaw lies in how the system manages session tokens, cookies, or other stateful data during interactions between different apps and system services. When this management is deficient, it can lead to unintended persistence or leakage of sensitive identifiers across application boundaries.
From a technical perspective, this type of vulnerability often stems from insufficient isolation mechanisms when transitioning between foregrounded applications or background processes. If an app retains access to state information that was intended for another context, such as authentication tokens or unique device identifiers, it can be exploited by malicious software running on the same device. This exploitation does not necessarily require a traditional exploit chain involving memory corruption but rather relies on logical errors in how permissions and data scopes are enforced during runtime operations. The lack of strict state separation enables an attacker to correlate user activities across different contexts without explicit consent or knowledge from the end-user.
The operational impact of this vulnerability is primarily centered around privacy violations through user fingerprinting. Fingerprinting refers to the process of collecting various pieces of information about a device and its user, such as installed apps, browser history snippets, network configurations, or behavioral patterns, to create a unique profile. In this case, an app could potentially infer details about other applications used by the user or their browsing habits if those activities leave residual state data accessible due to the flawed management logic. This compromises the confidentiality of user behavior and undermines trust in the operating system's ability to protect personal information from co-located malicious software.
This issue aligns with CWE Category 284, which covers Improper Access Control, specifically relating to insufficient authorization checks during resource access or state transitions. It also maps closely to MITRE ATT&CK technique T1071, Application Layer Protocol: Web Protocols, if the fingerprinting occurs via web-based interactions, or more broadly to data exfiltration techniques where an attacker gathers information about a victim's environment for later targeting. The ability to fingerprint users represents a significant privacy risk as it facilitates targeted advertising, surveillance, and potentially further social engineering attacks based on detailed user profiles derived from aggregated state data.
Mitigation strategies involve updating the operating system to versions that include Apple’s fixes for this specific state management flaw. For developers building applications that interact with other apps or rely on shared resources, implementing strict sandboxing principles is crucial. This includes ensuring that any inter-app communication uses secure APIs designed by the platform vendor rather than relying on implicit states or global variables. Additionally, minimizing the amount of sensitive data stored in persistent storage and clearing such data appropriately when no longer needed can reduce the attack surface for state-based information leakage attacks. Regular security audits focusing on authorization logic and state handling will help prevent similar vulnerabilities from being introduced into custom applications.