CVE-2026-28606 in Android
Summary
by MITRE • 09/08/2026
In handleBondStateChanged of AdapterService.java, there is a possible way to skip pairing due to a logic error in the code. This could lead to remote escalation of privilege without user consent with no additional execution privileges needed. User interaction is not needed for exploitation.
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Analysis
by VulDB Data Team • 09/08/2026
The vulnerability identified within the handleBondStateChanged method of AdapterService.java represents a critical logical flaw in the Bluetooth pairing workflow, specifically concerning how state transitions are validated before establishing trust relationships between devices. This logic error allows an attacker to bypass the mandatory user consent mechanism that is typically required for secure device pairing. In standard Android operating system behavior, when two Bluetooth devices attempt to pair, the system must prompt the user to confirm or reject the connection request to ensure that only authorized devices are granted access to sensitive data and services. However, due to this specific implementation defect, the service fails to properly enforce this consent step under certain conditions, effectively allowing a remote device to complete the pairing process without any explicit approval from the local user.
From a technical perspective, the flaw resides in the state machine logic that governs bond status changes. The handleBondStateChanged function is responsible for reacting to various Bluetooth link key events, including bonding attempts and completions. In this instance, the code likely fails to check for an existing pending pairing request or does not properly block automatic acceptance of a bond when user interaction has not been explicitly recorded as positive. This oversight creates a path where a malicious actor can exploit the asynchronous nature of Bluetooth communication to trigger the state change in a way that circumvents the security gate designed to protect user privacy and device integrity. The absence of this check means the system treats an unverified connection attempt as if it had received implicit or explicit authorization, thereby violating the principle of least privilege by granting elevated access rights based on flawed logic rather than verified intent.
The operational impact of this vulnerability is severe, primarily due to its potential for remote escalation of privileges without user consent and without requiring any additional execution privileges on the target device. An attacker within Bluetooth range can initiate a pairing request that will be automatically accepted by the vulnerable system. Once paired, the malicious device gains access to various APIs and data stores that are normally restricted to trusted peripherals. This could include access to contacts, call logs, messages, location history, and potentially even control over certain hardware features depending on the specific permissions granted to bonded devices. Because no user interaction is needed for exploitation, this vulnerability can be exploited in passive scenarios where a victim may not even realize that their device has been compromised or paired with an unauthorized entity.
This type of flaw aligns closely with CWE-20 Improper Input Validation and CWE-798 Use of Hard-coded Credentials if the logic relies on default trust states, but more accurately maps to CWE-693 Protection Mechanism Failure where a security control is bypassed due to implementation errors. In terms of offensive cybersecurity frameworks such as MITRE ATT&CK, this vulnerability facilitates initial access and lateral movement techniques by allowing an adversary to establish a trusted relationship with the target system remotely. The ability to pair without consent effectively neutralizes one of the primary defense-in-depth layers provided by user interaction prompts, leaving the device exposed to subsequent attacks that leverage the established trust channel for data exfiltration or further compromise.
Mitigation strategies must focus on correcting the logic within AdapterService.java to ensure that every bond state change is strictly gated behind a verified user consent event. Developers should implement robust checks that verify whether a pairing request has been explicitly approved by the user before updating the bond status to bonded. Additionally, implementing strict timeout mechanisms for pending pairing requests can prevent indefinite states where an attacker might attempt to exploit race conditions or timing issues. It is also recommended to enforce stricter permission models for newly paired devices, ensuring they receive minimal privileges until a higher level of trust is established through additional verification steps. Regular code audits focusing on security-critical state machines and input validation logic are essential to prevent similar logical flaws from being introduced in future updates.