# CVE-2025-13427: Authentication Bypass in Dialogflow CX Messenger

> CVE-2025-13427: Authentication Bypass in Dialogflow CX Messenger. CVSS 6.9 (CVSS 4.0).

Canonical: https://rewindex.com/cve/CVE-2025-13427
Last updated: 2026-09-30T16:10:00Z

- Published: 2025-12-18 21:57 UTC · Updated: 2026-09-30 16:10 UTC · Assigner: GoogleCloud
- CVSS: 6.9 (CVSS 4.0) · Severity: Medium
- EPSS: 0.47%, 41th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-287

## 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 vendors and products

- Google Cloud: Dialogflow CX Messenger

## Tracked companies

- [Google Cloud](https://rewindex.com/company/google-cloud.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2025-13427)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2025-13427)
- [https://docs.cloud.google.com/dialogflow/docs/release-notes\#December\_11\_2025](https://docs.cloud.google.com/dialogflow/docs/release-notes#December_11_2025)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2025-13427 · Markdown: https://rewindex.com/cve/CVE-2025-13427.md · JSON: https://rewindex.com/api/v1/cves/CVE-2025-13427 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T04:06:43.105Z