CVE-2026-4302 WowOptin: Next-Gen Popup Maker <= 1.4.29 - Unauthenticated Server-Side Request Forgery via 'link' Parameter in REST API
Unauthenticated attackers can exploit a REST API endpoint to perform Server-Side Request Forgery, accessing internal services via arbitrary web requests.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-4302?
CVE-2026-4302 is a high-severity server-side request forgery vulnerability in wpxpo WowOptin: Next-Gen Popup Maker – Create Stunning Popups and Optins for Lead Generation, published on 21 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-918
Which versions are affected by CVE-2026-4302?
How do I fix CVE-2026-4302?
No fix has been published for CVE-2026-4302 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-4302 being exploited?
There is no known exploitation of CVE-2026-4302 in the wild and no public exploit code.
Sources
Also known as GHSA-jrvw-hv7x-27p4.