CVE-2026-8155 in BuddyPress Plugin
Summary
by MITRE • 07/31/2026
The BuddyPress WordPress plugin before 14.5.0 does not properly enforce authorization on its private messaging endpoints, allowing any authenticated user (Subscriber+) to read, modify, or delete other users' private messages.
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Analysis
by VulDB Data Team • 07/31/2026
The vulnerability in the BuddyPress WordPress plugin affects versions prior to 14.5.0 and represents a critical authorization flaw that undermines the core security of private messaging functionality within WordPress environments. This issue stems from insufficient access control validation on private messaging endpoints, creating a privilege escalation vector that allows authenticated users with Subscriber level permissions or higher to bypass intended security boundaries. The flaw specifically impacts the plugin's ability to enforce proper user isolation between private messages, enabling malicious actors to access confidential communications between other users.
The technical implementation of this vulnerability manifests through inadequate input validation and access control checks within the plugin's messaging API endpoints. When authenticated users interact with private message functionality, the system fails to verify whether the requesting user has legitimate authorization to access or manipulate messages belonging to other users. This authorization bypass occurs at the application layer where the plugin should enforce strict user permissions based on message ownership and recipient relationships. The flaw can be exploited through direct API calls or by manipulating front-end interfaces that utilize these endpoints, making it particularly dangerous in multi-user environments where privacy is paramount.
From an operational impact perspective, this vulnerability creates significant risks for organizations relying on BuddyPress for community management, internal collaboration platforms, or social networking features within WordPress. The ability to read, modify, or delete private messages from other users compromises user privacy and can lead to data breaches, information disclosure, and potential reputational damage. Attackers could exploit this flaw to access sensitive personal information, confidential business communications, or potentially harmful content that users intended to keep private. In enterprise environments, this vulnerability may violate compliance requirements such as gdpr, hipaa, or other data protection regulations that mandate proper access controls and privacy protection measures.
The vulnerability aligns with CWE-285 (Improper Authorization) and can be classified under ATT&CK technique T1078 (Valid Accounts) and T1566 (Phishing). Organizations should implement immediate mitigations including upgrading to BuddyPress version 14.5.0 or later, which contains the necessary authorization fixes. Additional defensive measures include implementing network-level access controls, monitoring for unusual API activity patterns, and conducting regular security audits of WordPress plugins. Administrators should also consider implementing role-based access controls that further restrict messaging capabilities beyond the default plugin permissions, ensuring that even authenticated users cannot access unauthorized communications. The incident underscores the critical importance of maintaining current plugin versions and performing regular security assessments of third-party components in WordPress installations to prevent similar authorization bypass vulnerabilities from compromising user data integrity.