CVE-2026-108503 in Z80 Ultra
Summary
by MITRE • 10/10/2026
ZTE Z80 Ultra has an interface permission validation vulnerability. The callable functions provided by the system lack sufficient access control. An attacker can leverage these functions to read relevant information.
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Analysis
by VulDB Data Team • 10/10/2026
The identified security flaw in the ZTE Z80 Ultra represents a critical failure in application-level access control mechanisms, specifically categorized under CWE-269 Improper Privilege Management and CWE-732 Incorrect Permission Assignment for Critical Resource. This vulnerability stems from an insufficient validation of interface permissions within the device's operating system or specific applications running on it. In modern mobile ecosystems, particularly those based on Android derivatives like ZTE’s UI, interfaces often expose internal functions to other components via inter-process communication (IPC) mechanisms such as Intents in Android environments. When these callable functions lack rigorous access control checks, they effectively operate with elevated privileges that are not properly restricted by the user identity or application signature verifying their origin. This architectural oversight allows any entity capable of invoking these interfaces to bypass intended security boundaries, treating protected resources as if they were publicly accessible.
From a technical perspective, this vulnerability enables an attacker who has gained local access on the device, such as through a malicious third-party application installed by the user or via a compromised legitimate app with broad permissions, to execute privileged operations without authorization. The core of the issue lies in the system's failure to verify whether the calling process possesses the necessary security clearance before executing sensitive logic. Consequently, functions that should be restricted to system-level processes or specific trusted applications become accessible to lower-privileged entities. This misconfiguration effectively neutralizes the sandboxing protections designed to isolate apps from one another and from core system services, creating a pathway for unauthorized data exfiltration and state manipulation.
The operational impact of this vulnerability is significant regarding user privacy and device integrity. An attacker leveraging these unchecked callable functions can read sensitive information that was intended to remain confidential. This may include personal identifiable information (PII), authentication tokens, session cookies, location history, or internal system configurations. The ability to read such data without detection undermines the fundamental trust model of mobile devices where users expect their private data to be protected from unauthorized access by other applications on the same device. Furthermore, depending on the specific functions exposed, this could potentially lead to more severe consequences such as session hijacking if authentication credentials are accessible, or further privilege escalation if the read operations reveal secrets necessary for exploiting subsequent vulnerabilities in higher-privileged components of the OS.
This type of vulnerability aligns with several tactics within the MITRE ATT&CK framework for mobile platforms. It directly supports techniques related to Collection and Exfiltration over local networks or device storage, specifically those involving unauthorized access to files or directories (T1530) and potentially credential harvesting if sensitive tokens are exposed. The lack of proper permission validation also reflects weaknesses in the principle of least privilege, a cornerstone of secure system design that is violated here by allowing broad execution paths for privileged functions.
To mitigate this vulnerability, ZTE must implement strict access control checks on all exported interfaces and callable functions within the device's software stack. This involves enforcing signature-based or permission-based verification before any function invocation occurs, ensuring that only processes with explicitly granted privileges can interact with sensitive system components. Developers should adopt a default-deny approach for interface accessibility, requiring explicit whitelisting of trusted callers rather than relying on implicit trust assumptions. Additionally, regular security audits and static code analysis focused on IPC mechanisms are essential to identify similar misconfigurations across the software ecosystem. For users, until a patch is released, restricting app installations to official sources and keeping device firmware updated when available can help reduce the attack surface exposed by such flaws.