The Shai Hulud supply chain worm, attributed to TeamPCP, compromises CI/CD pipelines by injecting malicious npm/PyPI packages that harvest build credentials and pivot into production AWS cloud infrastructure. In a confirmed breach, attackers stole Jenkins EC2 instance role credentials via the Instance Metadata Service (IMDS), used them from external IPs, escalated privileges by creating an IAM user with AdministratorAccess, modified Redshift and Aurora security groups to open network paths, enumerated Secrets Manager for warehouse credentials, and exfiltrated data via the Redshift Data API. The attack demonstrates that pipeline identity equals production identity, with explicit attacker naming conventions (exfil-s3-* policies, exfil STS session names) providing high-fidelity detection opportunities.