Smart Popup by Supsystic <= 2.0.0 - Unauthenticated Server-Side Request Forgery via getMailchimpGroups AJAX Action
- ID
- WPSEC-2026-1522
- Plugin
- Customer Engagement System – Popup Builder, Forms, CRM & Email Marketing Automation (popup-by-supsystic)
- Affected
- all versions before 2.0.2
- Remediation
- Update to 2.0.2 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
- Weakness
- CWE-918
- Usage
- Plugin Low · Affected versions Low among sites WPSec scans, 2026-10-23
- Attack surface
- Smart Popup by Supsystic on WPSec AttackSurface
- Fix released
- Published
Description
The Popup Builder, Forms, CRM & Email Marketing Automation plugin for WordPress is vulnerable to Server-Side Request Forgery via the getMailchimpGroups AJAX action in all versions up to, and including, 2.0.0. This is due to two gaps: the action has no capability check or nonce verification, and the datacenter part of the MailChimp API key supplied in the request is placed into the API host without validation. 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. The affected code is in the plugin's legacy runtime, which is loaded on sites that used the plugin before the 2.0 release.
References
- https://wpsec.com/vuln/WPSEC-2026-1522/
- https://plugins.svn.wordpress.org/popup-by-supsystic/tags/2.0.2/
- https://wordpress.org/plugins/popup-by-supsystic/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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