---
id: CVE-2025-13427
title: >-
  An authentication bypass vulnerability in Google Cloud Dialogflow CX Messenger
  allowed unauthenticated users to interact with restricted chat agents, gaining
  access to the agents' knowledge and the ability to trigger their intents, by
  ma…
summary: >-
  An authentication bypass vulnerability in Google Cloud Dialogflow CX Messenger
  allowed unauthenticated users to interact with restricted chat agents, gaining
  access to the agents' knowledge and the ability to trigger their intents, by
  ma…
severity: none
cwe:
  - CWE-287
published: '2025-12-18'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T16:10:00.223'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-13427'
references:
  - url: >-
      https://docs.cloud.google.com/dialogflow/docs/release-notes#December_11_2025
    label: f45cbf4e-4146-4068-b7e1-655ffc2c548c
tags:
  - nvd
epss: 0.00472
epssPercentile: 0.38464
ingestedAt: '2026-09-30T17:13:20.769Z'
---

## Overview

An authentication bypass vulnerability in Google Cloud Dialogflow CX Messenger allowed unauthenticated users to interact with restricted chat agents, gaining access to the agents' knowledge and the ability to trigger their intents, by manipulating initialization parameters or crafting specific API requests. 

All versions after August 20th, 2025 have been updated to protect from this vulnerability. No user action is required for this.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.