CVE-2026-49310 in HarmonyOS
Summary
by MITRE • 09/09/2026
Permission control vulnerability in the event notification module. Impact: Successful exploitation of this vulnerability may affect service confidentiality.
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Analysis
by VulDB Data Team • 09/09/2026
The identified security flaw resides within the event notification subsystem, representing a critical failure in access control mechanisms that governs how sensitive information is disseminated to authorized and unauthorized entities. This type of vulnerability typically stems from insufficient validation of user privileges during the generation or delivery of system events, alerts, or status updates. In many enterprise architectures, the event notification module serves as a central hub for broadcasting state changes, security warnings, and operational metrics. When permission controls are improperly implemented within this layer, it creates an avenue where authenticated users with lower privilege levels can intercept, view, or manipulate notifications intended for higher-privileged administrators or other restricted user groups. This misconfiguration effectively bypasses the principle of least privilege, allowing lateral movement in terms of information access without requiring additional authentication credentials or exploitation of separate code execution flaws.
From a technical perspective, this vulnerability is classified under CWE-269, which denotes Improper Privilege Control, and often intersects with CWE-862 regarding Missing Authorization checks within the specific logic flow handling event payloads. The root cause generally involves server-side logic that fails to verify whether the requesting user has explicit permission to view the content of a specific notification before rendering it or sending it over the network. In some implementations, this may also involve client-side trust assumptions where sensitive data is included in JSON responses based on frontend role flags rather than strict backend authorization checks. Consequently, an attacker can craft requests that target internal event IDs or filter parameters to retrieve notifications containing confidential operational details, user identities, system configurations, or even temporary authentication tokens embedded within alert messages.
The operational impact of this vulnerability extends beyond simple data leakage, directly compromising the confidentiality integrity of the service environment. By accessing restricted event notifications, an adversary can gain deep insights into the internal workings of the application infrastructure. This intelligence gathering phase is critical for subsequent attack vectors such as social engineering, targeted privilege escalation, or precise exploitation of other known vulnerabilities within the system. For instance, if a notification reveals that a specific administrative account was recently reset or highlights a pending security patch deployment window, an attacker can time their exploits to coincide with periods of reduced monitoring or configuration drift. Furthermore, in multi-tenant environments, this flaw could lead to cross-tenant data leakage, where one customer’s operational alerts expose sensitive business logic or proprietary processes to competitors or malicious actors sharing the same infrastructure layer.
To mitigate this risk, immediate remediation efforts should focus on enforcing strict server-side authorization checks for every event retrieval operation. Developers must ensure that access control lists are consulted before any notification content is serialized and returned to the client, verifying not just user identity but also specific role-based permissions relative to the data being accessed. Implementing comprehensive logging of these access attempts can aid in detecting ongoing exploitation activities. Additionally, adopting a defense-in-depth strategy by sanitizing event payloads to remove sensitive metadata or high-risk information from general notification streams reduces the blast radius if such vulnerabilities are discovered later. Regular security audits and penetration testing focused on role-based access control boundaries will help identify similar misconfigurations across other modules of the application stack. Aligning these fixes with industry standards like OWASP Access Control guidelines ensures a robust framework for preventing unauthorized data exposure in future development cycles.