CVE-2026-4302
WowOptin: Next-Gen Popup Maker <= 1.4.29 - Unauthenticated Server-Side Request Forgery via 'link' Parameter in REST API
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.
INFO
Published Date :
March 21, 2026, 2:16 a.m.
Last Modified :
March 21, 2026, 2:16 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-4302
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update the WowOptin plugin to the latest version.
- Verify the plugin version is greater than 1.4.29.
- Ensure wp_safe_remote_get/post functions are used.
- Restrict access to the integration-action endpoint.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-4302.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-4302 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-4302
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-4302 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-4302 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by [email protected]
Mar. 21, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N Added CWE CWE-918 Added Reference https://plugins.trac.wordpress.org/browser/optin/tags/1.4.23/frontend/class-rest-frontend.php#L44 Added Reference https://plugins.trac.wordpress.org/browser/optin/tags/1.4.23/frontend/class-rest-frontend.php#L55 Added Reference https://plugins.trac.wordpress.org/browser/optin/tags/1.4.23/includes/integrations/implementations/class-webhook.php#L38 Added Reference https://plugins.trac.wordpress.org/browser/optin/tags/1.4.23/includes/integrations/implementations/class-webhook.php#L45 Added Reference https://plugins.trac.wordpress.org/browser/optin/trunk/frontend/class-rest-frontend.php#L44 Added Reference https://plugins.trac.wordpress.org/browser/optin/trunk/frontend/class-rest-frontend.php#L55 Added Reference https://plugins.trac.wordpress.org/browser/optin/trunk/includes/integrations/implementations/class-webhook.php#L38 Added Reference https://plugins.trac.wordpress.org/browser/optin/trunk/includes/integrations/implementations/class-webhook.php#L45 Added Reference https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3484392%40optin&new=3484392%40optin&sfp_email=&sfph_mail= Added Reference https://www.wordfence.com/threat-intel/vulnerabilities/id/b1c3e480-0221-4913-bcce-f34ded9edca8?source=cve