CVE-2026-52698: PushEngage Data Exposure Vulnerability

CVE-2026-52698 Overview

CVE-2026-52698 is a sensitive data exposure vulnerability affecting the PushEngage WordPress plugin, marketed as Web Push Notifications, eCommerce Automation & Chat Widget. The flaw impacts plugin versions up to and including 4.2.3. An authenticated attacker holding subscriber-level access can retrieve information that should be restricted to higher-privileged users. The weakness is classified as [CWE-201] Insertion of Sensitive Information Into Sent Data. Because the attack vector is the network and complexity is low, exploitation requires only valid subscriber credentials on the target WordPress site. The flaw crosses a privilege boundary, changing the security scope and exposing confidentiality, integrity, and availability impacts to a limited degree.

Critical Impact
A subscriber-level user can extract sensitive plugin data from vulnerable PushEngage installations, enabling reconnaissance against WordPress sites and downstream push notification infrastructure.

Affected Products

PushEngage – Web Push Notifications, eCommerce Automation & Chat Widget plugin for WordPress
All plugin versions <= 4.2.3
WordPress sites permitting subscriber registrations with the plugin installed

Discovery Timeline

2026-06-17 - CVE-2026-52698 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2026-52698

Vulnerability Analysis

The vulnerability stems from inadequate access control on plugin endpoints that return sensitive information. The PushEngage plugin exposes data through handlers that do not enforce capability checks consistent with the sensitivity of the response. An authenticated user assigned the WordPress subscriber role can invoke these handlers and retrieve data intended for administrators or editors managing push notification campaigns.

The weakness aligns with [CWE-201], which covers cases where sensitive information is included in transmitted data without sufficient authorization checks. The exposed data can include configuration details, subscriber lists, campaign metadata, or API tokens used to communicate with the PushEngage service backend.

The scope change indicator in the vector suggests that data exposed through the vulnerable component reaches resources beyond the immediate plugin context. This can include integrations with eCommerce platforms or chat widgets configured alongside push notifications.

Root Cause

The root cause is missing or insufficient authorization on one or more plugin endpoints. The plugin trusts the authentication state of the requester without verifying that the user holds the capability required to view the requested resource. WordPress provides current_user_can() and capability constants for exactly this purpose, and the absence of such checks creates the exposure.

Attack Vector

An attacker first acquires subscriber-level access, either by registering on a site that permits open registration or by compromising an existing low-privileged account. The attacker then issues authenticated HTTP requests to the vulnerable PushEngage endpoints. The plugin returns sensitive data in the response, which the attacker harvests for reconnaissance, lateral movement, or abuse of the connected PushEngage account.

No verified exploit code is publicly available. Technical details are documented in the Patchstack Vulnerability Report.

Detection Methods for CVE-2026-52698

Indicators of Compromise

Authenticated HTTP requests from subscriber-level accounts to PushEngage plugin endpoints under /wp-admin/admin-ajax.php or /wp-json/pushengage/
Unexpected outbound traffic to PushEngage API endpoints originating from subscriber sessions
New or unfamiliar subscriber accounts registered shortly before sensitive data access events
Access logs showing repeated requests to plugin AJAX actions from the same low-privileged session

Detection Strategies

Review WordPress access logs for requests to PushEngage endpoints originating from users with the subscriber role
Correlate user role with endpoint sensitivity using SIEM rules that flag low-privileged access to administrative plugin functions
Inspect HTTP responses from plugin endpoints for the presence of API keys, subscriber lists, or campaign configuration data

Monitoring Recommendations

Enable verbose logging on the WordPress installation and forward events to a centralized logging platform
Alert on bulk enumeration patterns where a single session retrieves large volumes of plugin data
Monitor account creation events on sites where open registration is enabled and correlate with subsequent plugin endpoint access

How to Mitigate CVE-2026-52698

Immediate Actions Required

Update the PushEngage plugin to the version above 4.2.3 as soon as the vendor releases a patched build
Audit existing subscriber accounts and disable any that are unused, dormant, or unrecognized
Disable open user registration on WordPress sites that do not require it through the Settings > General menu
Rotate any PushEngage API keys or credentials that may have been exposed through the vulnerable endpoints

Patch Information

Review the Patchstack Vulnerability Report for vendor patch availability and upgrade guidance. Administrators should apply the latest plugin release through the WordPress plugin manager once published.

Workarounds

Deactivate the PushEngage plugin until a patched version is available if push notification functionality is not business-critical
Restrict access to /wp-admin/admin-ajax.php and PushEngage REST routes using a web application firewall rule that blocks subscriber-role sessions
Apply the principle of least privilege by ensuring no production account holds unnecessary subscriber-level access on sites running the plugin

bash

# Example WAF rule concept to block subscriber-role access to PushEngage endpoints
# Adjust to match your WAF syntax (ModSecurity, Cloudflare, etc.)
SecRule REQUEST_URI "@rx /wp-json/pushengage/|/wp-admin/admin-ajax.php" \
  "id:1002698,phase:1,deny,status:403,\
   chain,msg:'Block low-privileged access to PushEngage endpoints'"
  SecRule REQUEST_COOKIES:wordpress_logged_in_* "@rx subscriber"