MailPoet – Newsletters, Email Marketing, and Automation <= 5.41.0 - Unauthenticated Open Redirect via 'referrer_form_url' Parameter
- ID
- WPSEC-2026-0949
- Plugin
- MailPoet – Newsletters, Email Marketing, and Automation (mailpoet)
- Affected
- all versions before 5.42.0
- Remediation
- Update to 5.42.0 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- Weakness
- CWE-601
- Usage
- Plugin Medium · Affected versions Medium among sites WPSec scans, 2026-10-14
- Attack surface
- MailPoet – Newsletters, Email Marketing, and Automation on WPSec AttackSurface
- Fix released
- Published
Description
The MailPoet plugin for WordPress is vulnerable to Open Redirect via the 'referrer_form_url' parameter of the CAPTCHA page shown for WordPress and WooCommerce registration forms in all versions up to, and including, 5.41.0, due to the CAPTCHA page using the request-supplied 'referrer_form_url' value as the form's submission target without validating its host, and rendering every other request value as a hidden form field. This makes it possible for unauthenticated attackers to craft a link to the site's CAPTCHA page whose form sends the visitor, and the data the form submits, to an attacker-controlled external site when the visitor submits the CAPTCHA.
References
- https://wpsec.com/vuln/WPSEC-2026-0949/
- https://plugins.svn.wordpress.org/mailpoet/tags/5.42.0/
- https://wordpress.org/plugins/mailpoet/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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