A vulnerability in the Google Cloud Apigee SetIntegrationRequest policy allowed remote attackers to perform Server-Side Request Forgery (SSRF) and exfiltrate service account access tokens.
For successful exploitation, an administrator must initially establish an insecure configuration of the API proxy.
Weakness
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.