Themify Builder <= 7.8.2 - Unauthenticated Arbitrary Mailing List Subscription via Optin Module
- ID
- WPSEC-2026-1147
- Plugin
- Themify Builder (themify-builder)
- Affected
- all versions before 7.8.3
- Remediation
- Update to 7.8.3 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- Weakness
- CWE-20
- Usage
- Plugin Low · Affected versions Low among sites WPSec scans, 2026-10-16
- Attack surface
- Themify Builder on WPSec AttackSurface
- Fix released
- Published
Description
The Themify Builder plugin for WordPress is vulnerable to Improper Input Validation via the Optin module's tb_optin_subscribe AJAX action in all versions up to, and including, 7.8.2. This is due to the handler building the provider, list or form ID and double opt-in setting from user-supplied tb_optin_* POST parameters instead of the settings stored for the module. This makes it possible for unauthenticated attackers to subscribe arbitrary e-mail addresses to any list, audience or form in the mail service accounts configured on the site, and to skip the double opt-in confirmation the site owner turned on.
References
- https://wpsec.com/vuln/WPSEC-2026-1147/
- https://plugins.svn.wordpress.org/themify-builder/tags/7.8.3/
- https://wordpress.org/plugins/themify-builder/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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