Vulnerability · Published Dec 18, 2025 · Assigned by GoogleCloud

CVE-2025-13427Authentication Bypass in Dialogflow CX Messenger

Medium 6.9

In plain English

A medium-severity improper authentication in Dialogflow CX Messenger from Google Cloud. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities).

Severity (CVSS 4.0)6.9Medium

Exploit odds (30 days)0.5%top 59.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
Google Cloud	Dialogflow CX Messenger	0 – through 2025-08-20

Weakness: CWE-287 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

References

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