CVE-2026-81279: Push Notification Auth Bypass Vulnerability

CVE-2026-81279 Overview

CVE-2026-81279 is a broken access control vulnerability in the Push Notification for Post and BuddyPress WordPress plugin, affecting versions up to and including 3.20. The flaw allows authenticated users with subscriber-level privileges to access plugin functionality that should be restricted to higher-privileged roles. The vulnerability maps to CWE-862: Missing Authorization.

Successful exploitation requires network access and low-privilege authentication with no user interaction. The impact affects confidentiality and integrity at a low level, with no direct availability impact.

Critical Impact

Authenticated subscribers can invoke plugin functions and modify or view data outside their intended authorization scope on affected WordPress sites.

Affected Products

• Push Notification for Post and BuddyPress WordPress plugin, versions 3.20 and prior
• WordPress sites with the plugin activated and open subscriber registration
• BuddyPress-enabled community sites using this plugin for notifications

Discovery Timeline

• 2026-08-27 - CVE-2026-81279 published to NVD
• 2026-08-27 - Last updated in NVD database

Technical Details for CVE-2026-81279

Vulnerability Analysis

The vulnerability stems from missing authorization checks in the Push Notification for Post and BuddyPress plugin. Plugin endpoints fail to verify that the requesting user holds the required capability before executing privileged actions. Any authenticated user, including default WordPress subscribers, can invoke these actions through standard plugin request handlers.

Broken access control at the subscriber tier is significant on WordPress deployments that allow open registration. An attacker registers a low-tier account and issues authenticated requests to the affected plugin endpoints. The plugin processes those requests without enforcing capability boundaries, resulting in unauthorized read or write operations.

The scope is unchanged, meaning the impact remains within the vulnerable WordPress instance. Confidentiality and integrity impact are limited to data exposed or modified through the plugin's push notification handlers.

Root Cause

The root cause is the absence of proper capability checks such as current_user_can() or nonce validation on plugin action handlers. Plugin code paths accept authenticated requests without validating that the caller has the administrative or editor role required to perform the operation. This is a classic Missing Authorization pattern in WordPress plugins.

Attack Vector

Exploitation requires an authenticated session on the target WordPress site. The attacker sends crafted requests to plugin AJAX or admin-post endpoints using subscriber credentials. See the Patchstack Vulnerability Report for endpoint-level technical details.

No public proof-of-concept exploit is listed in the enriched data, and the vulnerability is not present in the CISA Known Exploited Vulnerabilities catalog.

Detection Methods for CVE-2026-81279

Indicators of Compromise

• Unexpected changes to push notification configuration, templates, or delivery targets modified by non-administrative accounts
• Authenticated HTTP POST requests to Push Notification for Post and BuddyPress plugin endpoints originating from subscriber-role users
• Newly registered subscriber accounts followed within minutes by requests to plugin admin-post or AJAX handlers

Detection Strategies

• Audit WordPress access logs for requests to /wp-admin/admin-ajax.php and /wp-admin/admin-post.php referencing plugin actions from low-privilege sessions
• Correlate WordPress user role with the endpoints they invoke; subscribers should not reach plugin management actions
• Review WordPress wp_options and plugin-specific tables for modifications not tied to an administrator user ID

Monitoring Recommendations

• Enable a WordPress activity log plugin to record capability-sensitive events and user role usage
• Alert on new user registrations that immediately submit authenticated requests to plugin endpoints
• Forward WordPress and web server logs to a centralized SIEM for correlation across sessions and source IPs

How to Mitigate CVE-2026-81279

Immediate Actions Required

• Update the Push Notification for Post and BuddyPress plugin to a version later than 3.20 once a patched release is available from the vendor
• Disable the plugin on production sites until a fixed version is deployed if the risk of subscriber abuse is unacceptable
• Disable open user registration or restrict the default role to a non-subscriber value on sites that do not require public accounts

Patch Information

Refer to the Patchstack Vulnerability Report for current patch status and remediation guidance. Apply the vendor-supplied update as soon as it is published in the WordPress plugin repository.

Workarounds

• Use a Web Application Firewall (WAF) rule to block subscriber-role sessions from reaching the plugin's action handlers
• Set default_role in WordPress settings to a custom role with fewer capabilities than subscriber where feasible
• Audit and remove unused subscriber accounts to reduce the population of low-privilege attackers

# Restrict open registration and default role via wp-config.php / options
wp option update users_can_register 0
wp option update default_role subscriber

# Deactivate the vulnerable plugin until patched
wp plugin deactivate push-notification-for-post-and-buddypress