CVE-2025-13427

Medium

Description

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.

SeverityMedium

CVSS6.9

Exploit probability—

Product

Dialogflow CX Messenger

PublishedDec 18, 2025

First seenDec 18, 2025

Weakness typeCWE-287Improper authentication

How to fix

Vendor advisories

docs.cloud.google.com/dialogflow/docs/release-notes#December_11_2025

Affected products

Product	Affected versions	Fixed in
Google Cloud Dialogflow CX Messenger	v ≤ 2025-08-20	—

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