GCVE-110-CLOUD-2023-0027

Advisory Published

Vulnetix · Advisory published June 21, 2023

A critical authentication bypass vulnerability was discovered in Google Cloud API Gateway, affecting its JWT authentication method. The flaw, stemming from a business logic bug in the ESPv2 service proxy, allowed attackers to bypass authentication controls by manipulating HTTP methods. This vulnerability impacted various authentication methods including Firebase, Auth0, Okta, and Google ID tokens.

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Affected Products

Vendor	Product	Versions	Platforms
GCP	Cloud Services	—	—
GCP	API Gateway, Cloud Run, App Engine, Cloud Functions	—	—

Aliases

CVE-2023-30845

References

Critical Authentication Bypass in Google Cloud API Gateway

advisory

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