WowOptin: Next-Gen Popup Maker <= 1.4.29 - Unauthenticated Server-Side Request Forgery via 'link' Parameter in REST API
Strategic Overview
- Status
- Patched in 1.4.30
- Affected Plugin
- WowOptin: Next-Gen Popup Maker – Create Stunning Popups and Optins for Lead Generation
- Affected Version
<= 1.4.29- CVSS
- 7.2High
- Weakness type
- CWE-918 · Server-Side Request Forgery (SSRF)
- CVE
CVE-2026-4302
At a glance
CVE-2026-4302 is a high-severity Server-Side Request Forgery (SSRF) vulnerability in the WowOptin: Next-Gen Popup Maker WordPress plugin, affecting versions <= 1.4.29. It carries a CVSS score of 7.2 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 1.4.30; sites on affected versions should update now. Disclosed March 2026, reported by Itthidej Aramsri (Boeing777).
Vulnerability Overview
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.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user.
CWE-918: Server-Side Request Forgery (SSRF)
WowOptin: Next-Gen Popup Maker <= 1.4.29 carries this weakness at wp_remote_get(), and reaching it takes no account at all. Server-side request forgery means the application fetches a URL supplied by the caller, turning the server into a proxy for requests the attacker could not make directly.
The request originates from inside the hosting network, which is how these flaws reach cloud metadata endpoints, internal admin panels and services that trust local traffic. For WowOptin: Next-Gen Popup Maker the fix is 1.4.30: builds <= 1.4.29 are affected, anything from 1.4.30 onward is not.
Remediation
Update to version 1.4.30, or a newer patched version
How does WordSec protect against this?
Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: WowOptin: Next-Gen Popup Maker 1.4.30 closes this, and updating the plugin is the step that ends it.
- Firewall
- Login Security
- Alerts
External References
Related records
Other vulnerabilities in WowOptin: Next-Gen Popup Maker – Create Stunning Popups and Optins for Lead Generation
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