How an Exposed Jenkins Instance Led to a Full-Scale Infrastructure Compromise

An unauthenticated, publicly exposed Jenkins instance allowed attackers to execute remote code, escalate across multiple production and UAT servers, and harvest hardcoded credentials (AWS, Redis, BitBucket) that were subsequently used to access a production database containing customer and employee PII; the affected organization mitigated the incident by isolating servers, rotating credentials, and enforcing stronger access controls.