CVE-2026-49303 in HarmonyOS
Summary
by MITRE • 08/17/2026
Permission control vulnerability in the notification module. Impact: Successful exploitation of this vulnerability may affect availability.
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Analysis
by VulDB Data Team • 08/17/2026
The identified security flaw resides within the notification subsystem of the application, specifically concerning its access control mechanisms. This vulnerability is classified as a permission control issue where the system fails to properly enforce authorization policies for specific operations related to notifications. In a secure architecture, any action that modifies or retrieves sensitive data must be validated against the current user's privileges and role assignments. However, in this instance, the application logic allows unauthenticated users or those with insufficient permissions to interact with notification endpoints in ways that were not intended by the developers. This lack of strict enforcement creates an avenue for attackers to bypass standard security boundaries, leading directly to a compromise of system availability rather than confidentiality or integrity at this stage.
From a technical perspective, the root cause lies in the improper verification of user permissions before processing requests directed at notification-related functions. When a request is received, the application likely fails to check whether the requesting entity possesses the necessary rights to perform the specific action, such as creating, deleting, or modifying notifications. This oversight allows an attacker to send crafted HTTP requests that manipulate internal states or trigger resource-intensive operations without valid authentication tokens or with invalid privilege levels. The absence of robust input validation combined with weak authorization checks means that the system processes these malicious inputs as legitimate commands, thereby disrupting normal service operations and degrading performance for all users.
The operational impact of this vulnerability is primarily centered on availability, which aligns with the CIA triad's emphasis on ensuring systems remain accessible to authorized users. By exploiting this flaw, an attacker can potentially cause a denial-of-service condition through various means such as triggering excessive resource consumption, causing application crashes via malformed data processing, or flooding the notification queue with malicious entries that degrade system responsiveness. This disruption affects the reliability of critical alerting mechanisms and general user experience, leading to potential business interruptions and loss of trust in the platform's stability. The impact is significant because it undermines the core function of providing timely and reliable notifications, which are often crucial for operational monitoring and user engagement.
This vulnerability maps closely to CWE-284 Improper Access Control, as the system fails to restrict actions based on authorized identities. Furthermore, from an offensive security standpoint, this behavior can be associated with ATT&CK technique T1078 Valid Accounts if exploited by compromised credentials or T1505 Server Software Component if it involves exploiting a specific module within the server stack. The exploitation path typically involves identifying unprotected API endpoints related to notifications and sending requests that trigger resource exhaustion or logical errors, thereby achieving availability impact without needing elevated privileges for other parts of the system.
To mitigate this vulnerability, immediate remediation efforts should focus on implementing strict access control checks at every entry point within the notification module. Developers must ensure that all functions requiring modification of state verify the user's role and permissions before executing any logic. Implementing a centralized authorization middleware can help standardize these checks across the application. Additionally, integrating rate limiting and input validation mechanisms will further harden the system against abuse attempts designed to exhaust resources. Regular security audits and penetration testing should be conducted to identify similar gaps in other modules, ensuring that access control policies are consistently enforced throughout the entire software lifecycle.