CVE-2026-28624 in Android
Summary
by MITRE • 09/08/2026
In multiple locations, there is a possible read/write access to files without the proper permissions due to a confused deputy. This could lead to local escalation of privilege 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 described represents a classic Confused Deputy problem, where an application or system component acts on behalf of a user but fails to properly validate its own authority when accessing sensitive resources. This flaw allows unauthorized read and write operations against files that should be protected by strict permission controls. The core issue lies in the failure of the operating system or application logic to enforce mandatory access control policies during file I/O operations, effectively bypassing standard security boundaries. Because the vulnerability does not require additional execution privileges beyond what is already granted to the compromised process, it facilitates a direct path for local privilege escalation. An attacker who gains even minimal user-level access can exploit this misconfiguration to manipulate critical system files or extract sensitive data that was intended to remain confidential.
From a technical perspective, this flaw indicates a deficiency in how file descriptors and security contexts are managed during runtime operations. The confused deputy scenario typically arises when a privileged process performs an action requested by an unprivileged user without re-evaluating the access rights associated with the specific resource being accessed. In many modern operating systems, such as Windows or Linux-based distributions, this can occur if symbolic links, temporary files, or configuration paths are not handled with atomic operations and proper ownership checks. The lack of rigorous validation allows an attacker to redirect file writes to arbitrary locations or read protected configurations by manipulating the context in which the privileged process operates. This bypasses standard discretionary access control lists because the elevated process itself is performing the action, making it appear legitimate to basic audit logs unless deeper behavioral analysis is employed.
The operational impact of this vulnerability is severe due to its potential for local privilege escalation without user interaction. Since exploitation does not require a victim to click a link or open a malicious document, the attack surface is significantly expanded. Any authenticated user on the system can potentially trigger the flaw in the background. This leads to a complete compromise of data integrity and confidentiality within the affected environment. Attackers can use this access to install persistent backdoors, modify authentication mechanisms, or exfiltrate sensitive information such as cryptographic keys, session tokens, or personal identifiable information stored in unprotected files. The absence of user interaction also means that social engineering is not required, making automated exploitation tools highly effective against vulnerable systems.
To mitigate this risk, organizations must implement strict file permission policies and ensure that all privileged processes adhere to the principle of least privilege. Developers should review code paths involving file I/O operations to ensure that access checks are performed at every step, particularly when dealing with user-supplied input or dynamic file paths. Utilizing mandatory access control systems such as SELinux on Linux or AppLocker on Windows can provide an additional layer of protection by restricting what actions even privileged processes can perform regardless of their nominal permissions. Furthermore, implementing robust auditing and monitoring solutions will help detect anomalous file access patterns that may indicate exploitation attempts. Regular security assessments focused on privilege escalation vectors are essential to identify and remediate such confused deputy vulnerabilities before they can be leveraged in a real-world attack scenario.
This vulnerability aligns with CWE-269 Improper Privilege Management, specifically the sub-category of Confused Deputy problems where an actor performs actions without proper authorization checks relative to its current context. In terms of offensive security frameworks, this behavior is consistent with techniques found in MITRE ATT&CK under Local Privilege Escalation, particularly those involving abuse of system functionality or misconfigured file permissions. Addressing these issues requires a combination of secure coding practices, rigorous configuration management, and continuous monitoring to ensure that the integrity of the operating environment remains intact against internal threats.