CVE-2026-81279 in Push Notification for Post and Buddypress Plugin
Summary
by MITRE • 08/27/2026
Subscriber Broken Access Control in Push Notification for Post and BuddyPress <= 3.20 versions.
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Analysis
by VulDB Data Team • 08/27/2026
The vulnerability identified as Subscriber Broken Access Control in the Push Notification plugin for WordPress, affecting versions up to 3.20, represents a critical flaw in how user permissions are validated during push notification operations within integrated social platforms like Post and BuddyPress. This issue stems from an insufficient check on the authority of the requesting user when initiating or managing push notifications. In a properly secured environment, only administrators or users with specific elevated privileges should be able to configure broadcast settings or trigger mass notifications that affect other subscribers. However, due to this broken access control mechanism, authenticated attackers possessing even the lowest level of privilege, such as those assigned the Subscriber role, can exploit the application logic to perform actions beyond their intended scope. This misconfiguration allows these low-privilege users to manipulate notification parameters, potentially leading to unauthorized dissemination of information or disruption of service for other site members.
From a technical perspective, this vulnerability is classified under CWE-269, which denotes Improper Privilege Control, and aligns with MITRE ATT&CK technique T1078, Valid Accounts, as it involves the abuse of legitimate user credentials to gain unauthorized access to functionality. The core issue lies in the server-side validation logic failing to verify whether the current session's role has sufficient rights before processing requests related to push notification configurations or broadcasts. When a Subscriber attempts to send a notification intended for all users or modify settings that should be restricted, the application fails to reject the request based on their insufficient privileges. This lack of strict enforcement allows the attacker to bypass standard security boundaries inherent in WordPress's role-based access control system, effectively elevating their capabilities within the context of the push notification feature without requiring any additional exploitation steps such as SQL injection or cross-site scripting.
The operational impact of this vulnerability is significant for sites relying on these plugins for user engagement and communication. An attacker with Subscriber-level access can abuse this flaw to send unsolicited bulk notifications, causing service disruption through denial-of-service conditions if the notification volume overwhelms client devices or server resources. Furthermore, in environments where sensitive information might be shared via push alerts, such as internal company updates on a BuddyPress network, an attacker could potentially leak confidential data by targeting specific user segments or broadcasting false information to manipulate recipients. This undermines the integrity and confidentiality of communications facilitated by the plugin, eroding trust among users and exposing the organization to reputational damage and potential compliance violations if personal data is mishandled through these unauthorized channels.
Mitigation strategies for this vulnerability primarily involve immediate software updates and rigorous access control auditing. Users running Post or BuddyPress with Push Notification versions 3.20 or earlier must upgrade to a patched version where the developers have implemented strict role-based checks before processing any push notification requests. Administrators should also review user roles within their WordPress installation, ensuring that no unnecessary users are assigned elevated privileges and that default subscriber permissions remain as restrictive as possible until patches are applied. Additionally, implementing Web Application Firewalls with rules targeting known exploitation patterns for broken access control can provide a layer of defense by blocking suspicious request payloads associated with privilege escalation attempts in the notification endpoints. Regular security audits focusing on API endpoint authorization logic are recommended to prevent similar misconfigurations in other plugin functionalities.