What the vulnerability does
01Description
The WowOptin: Next-Gen Popup Maker plugin for WordPress is vulnerable to Server-Side Request Forgery in all versions up to, and including, 1.4.29. This is due to the plugin exposing a publicly accessible REST API endpoint (optn/v1/integration-action) with a permission_callback of __return_true that passes user-supplied URLs directly to wp_remote_get() and wp_remote_post() in the Webhook::add_subscriber() method without any URL validation or restriction. The plugin does not use wp_safe_remote_get/post which provide built-in SSRF protection. This makes it possible for unauthenticated attackers to make web requests to arbitrary locations originating from the web application, which can be used to query and modify information from internal services.
Explanation of Vulnerability in Simple Terms
02Summary
WowOptin versions up to 1.4.29 contain a server-side request forgery vulnerability that allows unauthenticated attackers to make the site send HTTP requests to internal or external systems on their behalf. No user interaction is required. The vulnerability can leak sensitive information or modify data on systems the site can reach.
What an attacker can do
03Attacker Capabilities
Make the site send HTTP requests to internal systems or external servers to read data or perform actions.
Potential impact on your site
04Site Impact
Attackers can access internal services, leak sensitive data, or pivot to other systems your site can reach.
Conditions required to exploit
05Prerequisites
Network access to the site; no authentication or user interaction required.
Key dates
06Disclosure timeline
March 21, 2026
CVE published
April 8, 2026
Record updated
