CVE-2026-49302 in HarmonyOS
Summary
by MITRE • 08/17/2026
Permission control vulnerability in the notification service module. Impact: Successful exploitation of this vulnerability may affect service confidentiality.
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Analysis
by VulDB Data Team • 08/17/2026
The identified security flaw resides within the notification service module, specifically manifesting as an improper access control mechanism that fails to adequately restrict user permissions. This type of vulnerability is classically categorized under CWE-269, which denotes Improper Privilege Control, and often overlaps with CWE-862 regarding Missing Authorization checks in web applications or API services. The core technical issue involves a logic error where the application does not sufficiently verify whether an authenticated actor possesses the requisite privileges to access specific notification data before fulfilling the request. In many modern architectures utilizing microservices or RESTful APIs, this often stems from relying on client-side inputs for authorization decisions rather than enforcing strict server-side validation against a centralized policy engine or role-based access control list. Consequently, the system fails to distinguish between authorized and unauthorized entities when processing requests related to notification retrieval, modification, or deletion operations.
The operational impact of this vulnerability is primarily centered on the compromise of service confidentiality, as indicated in the initial report. An attacker who successfully exploits this flaw can bypass intended security boundaries to access sensitive information contained within notifications that should be restricted to specific user roles or administrative accounts. This could include personally identifiable information, internal corporate communications, system alerts containing infrastructure details, or private messages between users. The breach of confidentiality undermines the trust model of the application and may lead to further downstream attacks if the exposed data reveals patterns in user behavior, organizational structure, or technical configurations that can be leveraged for social engineering or targeted exploitation efforts.
From a threat modeling perspective aligned with the MITRE ATT&CK framework, this vulnerability facilitates techniques associated with Credential Access and Collection of Application Data. Specifically, it aligns with T1530, which covers data from cloud storage objects if notifications are stored in external buckets, or more broadly with unauthorized access to sensitive resources that should be protected by identity and access management controls. The exploitation typically requires the attacker to first authenticate into the system, obtaining a valid session token or API key, but then manipulating request parameters such as user IDs, notification identifiers, or HTTP headers to trick the server into returning data belonging to other users or higher-privileged accounts. This is often achieved through IDOR (Insecure Direct Object Reference) patterns where sequential or predictable identifiers are used without additional authorization checks tied to the current session context.
To mitigate this vulnerability, developers must implement robust server-side access control logic that explicitly verifies user permissions for every sensitive operation within the notification service module. It is critical to adopt a deny-by-default approach where any request lacking explicit proof of privilege is rejected immediately. Implementing role-based or attribute-based access control models can help standardize these checks across different endpoints. Additionally, using non-sequential and unpredictable identifiers for notifications reduces the risk of enumeration attacks that often precede exploitation of such flaws. Security testing should include rigorous penetration tests focusing on horizontal and vertical privilege escalation scenarios to ensure that users cannot interact with resources belonging to other tenants or higher-level administrators. Regular code reviews focused on authentication and authorization flows are also essential to maintain the integrity of the service's security posture over time.