# Advanced Form Integration <= 2.10.0 - Unauthenticated PHP Object Injection via Nex-Forms Submission Fields

- **ID:** WPSEC-2026-0778
- **Plugin:** Advanced Form Integration — Connect Forms to 300+ Apps (`advanced-form-integration`), https://wordpress.org/plugins/advanced-form-integration/
- **Affected versions:** all versions before 2.10.3
- **Fixed in:** 2.10.3 (Update to 2.10.3 or later.)
- **Severity:** High 8.1 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
- **Weakness:** CWE-502
- **Usage among sites WPSec scans:** plugin Low, affected versions Low (as of 2026-10-11)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/advanced-form-integration
- **Fix released:** 2026-10-11
- **Published:** 2026-10-12
- **URL:** https://wpsec.com/vuln/WPSEC-2026-0778/

## Description

The Advanced Form Integration plugin for WordPress is vulnerable to PHP Object Injection via Nex-Forms submission field values in all versions up to, and including, 2.10.0. This is due to the Nex-Forms trigger passing untrusted field values to maybe_unserialize(). The trigger runs on plugins_loaded for any POST request that contains a 'nex_forms_Id' parameter. It reads field values either straight from $_POST (when the form has no stored entry) or from a stored entry the request can choose, and any value that looks serialized is unserialized. This makes it possible for unauthenticated attackers to inject a PHP object when an integration is connected to a Nex-Forms form. The plugin itself contains no known POP chain. If a POP chain is present through another plugin or theme installed on the site, an attacker could delete arbitrary files, retrieve sensitive data, or execute code.

## References

- https://wpsec.com/vuln/WPSEC-2026-0778/
- https://plugins.svn.wordpress.org/advanced-form-integration/tags/2.10.3/
- https://wordpress.org/plugins/advanced-form-integration/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-0778/

License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Free to use, share and adapt, also commercially, if you credit WPSec and link to this advisory.