CVE-2026-107037 in Notes
Summary
by MITRE • 10/29/2026
Insecure permissions in the NotificationHelper component of NoNonsense Notes versionCode 72600 allows unauthorized attackers to write in another user's notes via supplying a note id.
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Analysis
by VulDB Data Team • 10/29/2026
The vulnerability identified within the NotificationHelper component of NoNonsense Notes, specifically affecting version code 72600, represents a critical failure in access control mechanisms that governs how application data is managed across different security contexts. This flaw stems from an insecure permission configuration where the application fails to adequately enforce isolation between distinct user sessions or accounts stored within its local database. In Android-based environments, applications often utilize SQLite databases for persistent storage, and while these databases are typically sandboxed by default, improper handling of file permissions or content providers can expose sensitive data to other installed applications on the same device if not configured correctly. The specific issue here involves a logic error where the NotificationHelper component does not sufficiently validate that the requesting entity has legitimate ownership over the note identified by the provided identifier before allowing write operations.
From a technical perspective, this vulnerability is classified under CWE-269, which addresses Improper Privilege Management, and more specifically aligns with CWE-732, describing Incorrect Permission Assignment for Critical Resource. The core of the exploit relies on the attacker supplying an arbitrary note ID to the NotificationHelper interface or internal method without undergoing a rigorous ownership verification process. In many Android applications, notifications are triggered by background services that may have elevated privileges compared to standard UI activities. If these services do not re-verify user identity against the resource being modified, they become susceptible to unauthorized modification attacks. The attacker can iterate through note IDs, which are often sequential or predictable integers, and attempt write operations such as editing content, deleting entries, or altering metadata for notes belonging to other users who share the same device profile or account context within the application.
The operational impact of this vulnerability is severe regarding data integrity and confidentiality. An unauthorized attacker can modify another user's private notes without authentication, leading to potential privacy violations where sensitive personal information, business secrets, or confidential communications are exposed or altered. This lack of authorization control undermines the fundamental trust model of the note-taking application, as users expect their digital records to be isolated from other applications and potentially other local accounts on a shared device. Furthermore, this flaw could facilitate further attacks such as social engineering if an attacker alters historical notes to mislead victims about past conversations or events. It also impacts availability by allowing malicious actors to delete critical information, thereby disrupting the user's workflow and data retention strategies.
This behavior is consistent with attack patterns observed in MITRE ATT&CK framework under techniques related to Privilege Escalation and Collection of Application Data. Specifically, it mirrors behaviors seen in CWE-862 missing authorization checks where an actor performs actions on behalf of another user without proper permission verification. To mitigate this vulnerability, developers must implement strict access control lists within the application's backend logic. Every write operation initiated by the NotificationHelper or any other component must verify that the current authenticated session matches the owner ID associated with the target note ID in the database. Additionally, implementing Content Provider permissions with android:exported set to false and utilizing explicit intents for inter-component communication can reduce the attack surface. Regular security audits focusing on input validation and authorization checks are essential to ensure that resource identifiers supplied by external or internal callers are validated against user ownership records before any data modification occurs.