A vulnerability exists in Google Apigee's JavaCallout policy https://docs.apigee.com/api-platform/reference/policies/java-callout-policy that allows for remote code execution.
It is possible for a user to write a JavaCallout that injected a malicious object into the MessageContext to execute arbitrary Java code and system commands at runtime, leading to unauthorized access to data, lateral movement within the network, and access to backend systems.
The Apigee hybrid versions below have all been updated to protect from this vulnerability:
Exploitability
AV:NAC:LAT:NPR:LUI:NVulnerable System
VC:HVI:HVA:HSubsequent System
SC:NSI:NSA:N8.7/CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/U:ClearOther