---
id: "CVE-2026-110886"
kind: "vulnerability"
aliases: ["CVE-2026-110886"]
title: "Deserialization of Untrusted Data vulnerability in QuantumCloud Conversational Forms for ChatBot\u2026"
severity: "critical"
cvss: 9.8
epss: null
exploited: false
status: "open"
category: "package"
products: [{"name": "conversational-forms", "fixed": ["1.5.2"], "affected": "<= 1.5.1", "ecosystem": "wordpress"}]
ecosystems: []
tags: ["conversational-forms", "package", "php", "php-object-injection", "unauthenticated", "wordpress", "wpbot"]
not_affected_if: ["plugin-not-installed", "version-1.5.2-or-later"]
published_at: "2026-10-18T11:16:37+00:00"
first_seen_at: "2026-10-23T21:57:14+00:00"
updated_at: "2026-10-23T23:27:41+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-110886", "first_seen_at": "2026-10-23T21:57:14+00:00"}, {"source": "analyst", "url": null, "first_seen_at": "2026-10-23T23:27:41+00:00"}]
---

# Deserialization of Untrusted Data vulnerability in QuantumCloud Conversational Forms for ChatBot…

WPBot – ChatBot Conversational Forms (QuantumCloud, WordPress slug conversational-forms) <= 1.5.1 has unauthenticated PHP object injection. The wpbot_capture_form_value AJAX action stores the 'answer' parameter after only sanitize_text_field(), which leaves serialized data intact. The plugin later passes the stored value through maybe_unserialize(). RCE needs a usable gadget chain from another plugin or theme. About 1,000+ active installs. Fix released 2026-10-14.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- wordpress:conversational-forms affected <= 1.5.1 fixed 1.5.2

## How to check

In wp-admin > Plugins, check the version of 'WPBot – ChatBot Conversational Forms'. Or run: wp plugin get conversational-forms --field=version. Versions 1.5.1 and earlier are vulnerable.

## Fix

Update to 1.5.2 or later (1.5.3 is current), or deactivate and remove the plugin. Patchstack offers a virtual-patch rule if you cannot update right away.

## Timeline

- 2026-10-23T21:57:14+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-110886
- 2026-10-23T23:27:41+00:00 analyst — Read Patchstack, WPSEC-2026-1088 and wordpress.org changelog: unauthenticated PHP object injection via wpbot_capture_form_value AJAX 'answer' param, fixed in 1.5.2 (1.5.3 current). No exploitation or public PoC found; no social search (low-profile plugin, ~1,000 installs). CVSS 9.8 (CNA) vs 8.1 (WPSec, AC:H): gadget chain needed for RCE.

## Documents

- [advisory] Patchstack: Conversational Forms for ChatBot <= 1.5.1 PHP Object Injection https://patchstack.com/database/wordpress/plugin/conversational-forms/vulnerability/wordpress-conversational-forms-for-chatbot-plugin-1-5-1-php-object-injection-vulnerability
- [advisory] WPSEC-2026-1088: Unauthenticated PHP Object Injection via wpbot_capture_form_value https://wpsec.com/vuln/WPSEC-2026-1088/
- [fix] WPBot – ChatBot Conversational Forms (changelog, 1.5.3 current) https://wordpress.org/plugins/conversational-forms/

## From the sources

Deserialization of Untrusted Data vulnerability in QuantumCloud Conversational Forms for ChatBot conversational-forms allows Object Injection.This issue affects Conversational Forms for ChatBot: from n/a through 1.5.1.

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