CVE-2026-107023 in MyBrain
Summary
by MITRE • 10/29/2026
Insecure permissions in the ContentProvider component of mhss1 MyBrain v3.1.0 allows unauthorized attackers to arbitrarily read another user's private notes/tasks/diary content.
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Analysis
by VulDB Data Team • 10/29/2026
The vulnerability identified within the mybrain application version 3.1.0 represents a critical failure in access control mechanisms, specifically manifesting as insecure permissions on an Android ContentProvider component. This flaw stems from a misconfiguration where the provider is exported and lacks appropriate permission checks or signature-based restrictions that would limit access to authorized applications only. In the Android ecosystem, a ContentProvider serves as one of the primary ways for apps to share data with other applications. When such a component is improperly secured, it effectively exposes the underlying database or file storage to any application installed on the device, regardless of whether those applications have legitimate business reasons to access that specific user's private information. This architectural weakness allows malicious actors to bypass standard security boundaries and directly query the provider using standard Android APIs like ContentResolver.
The technical nature of this flaw aligns closely with CWE-284, which describes Improper Access Control, as well as CWE-732, concerning Permission Issues that are too broad or permissive. By failing to enforce strict identity verification before granting read access, the application violates the principle of least privilege. An attacker can construct a malicious payload or simply use an existing tool to send content provider queries targeting specific URIs associated with notes, tasks, and diary entries. Since these data types typically contain highly sensitive personal information, including daily schedules, medical records, financial details, or intimate thoughts, the ability to read them without authentication constitutes a severe breach of confidentiality. The vulnerability does not require complex exploitation techniques; it relies on the fundamental misconfiguration of Android manifest permissions, making it easily exploitable by any user with basic technical knowledge or automated scanning tools.
From an operational impact perspective, this vulnerability enables unauthorized data exfiltration that can lead to significant privacy violations and potential downstream attacks such as social engineering or identity theft. Attackers who gain access to a victim's private notes may discover security questions answers, personal relationships, or location history, which can be leveraged for further compromise of the user's digital identity. Furthermore, because this is an insecure permissions issue rather than a code execution flaw, it does not typically lead to remote code execution on the device itself but remains a high-severity data exposure risk. The impact is compounded by the fact that users often trust mobile applications with their most personal thoughts and plans, assuming these are stored securely within the app's sandboxed environment.
Mitigation strategies must focus on tightening access controls at both the application configuration level and through defensive coding practices. Developers should immediately review the AndroidManifest.xml file to ensure that exported ContentProviders have android:exported set to false unless absolutely necessary for inter-app communication, in which case they must implement strict permission checks using Context.checkCallingPermission or verify the signature of the calling app via PackageManager.getPackageInfo. Additionally, implementing row-level security within the database queries ensures that even if a provider is accessible, it only returns data belonging to the authenticated user associated with the current session token or account context. Regular static application security testing should be employed to detect such misconfigurations early in the development lifecycle, and users are advised to update their applications as soon as patches become available to restore proper access boundaries.