This guide explains how Bitbucket functions as critical infrastructure—housing code, pipelines, and infrastructure definitions—making it a prime target for supply chain attacks if misconfigured. It emphasizes identity as the primary control layer, requiring SSO, MFA, SSH keys, and strict least-privilege access, along with automated lifecycle management via SCIM to prevent orphaned accounts. It also highlights enforcing strong code governance through branch protections, mandatory PR reviews, and granular permissions, while using audit logs to detect suspicious activity. Pipeline security is equally critical, with recommendations to isolate runners, secure secrets through vaults, and continuously scan dependencies and containers. The key takeaway is that securing Bitbucket requires tight con

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