Google Cloud Dialogflow CX Messenger up to 2025-08-20 improper authentication

Summaryinfo

A vulnerability classified as critical has been found in Google Cloud Dialogflow CX Messenger up to 2025-08-20. Affected by this issue is some unknown functionality. This manipulation causes improper authentication. This vulnerability is registered as CVE-2025-13427. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in Google Cloud Dialogflow CX Messenger up to 2025-08-20. It has been declared as critical. Affected by this vulnerability is some unknown processing. The manipulation with an unknown input leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at docs.cloud.google.com. This vulnerability is known as CVE-2025-13427 since 11/19/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 12/19/2025).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Messaging Software

Vendor

• Google

Name

• Cloud Dialogflow CX Messenger

Version

• 2025-08-20

License

• free

Website

• Vendor: https://www.google.com/

CPE 2.3info

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CPE 2.2info

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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