# Conversational Forms for ChatBot <= 1.5.1 - Unauthenticated PHP Object Injection via Form Entry Answer

- **ID:** WPSEC-2026-1088
- **Plugin:** WPBot – ChatBot Conversational Forms (`conversational-forms`), https://wordpress.org/plugins/conversational-forms/
- **Affected versions:** all versions before 1.5.2
- **Fixed in:** 1.5.2 (Update to 1.5.2 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 None seen (as of 2026-10-16)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/conversational-forms
- **Fix released:** 2026-10-14
- **Published:** 2026-10-16
- **URL:** https://wpsec.com/vuln/WPSEC-2026-1088/

## Description

The WPBot – ChatBot Conversational Forms plugin for WordPress is vulnerable to PHP Object Injection via the 'answer' parameter of the wpbot_capture_form_value AJAX action in all versions up to, and including, 1.5.1, due to deserialization of untrusted input. The action is available to unauthenticated users and saves the answer after only sanitize_text_field(), which leaves serialized data intact. The plugin later runs the stored value through maybe_unserialize(), for example when an administrator views the form's entries. This makes it possible for unauthenticated attackers to inject a PHP object. The plugin itself contains no known POP chain. If a POP chain is present through another plugin or theme on the target system, it could allow the attacker to delete arbitrary files, retrieve sensitive data, or execute code.

## References

- https://wpsec.com/vuln/WPSEC-2026-1088/
- https://plugins.svn.wordpress.org/conversational-forms/tags/1.5.2/
- https://wordpress.org/plugins/conversational-forms/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-1088/

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.