Top Strategies to Protect Your Website from Subdomain Takeovers | UpGuard

This report explains subdomain takeovers — how orphaned or misconfigured DNS CNAME records that point to unclaimed third‑party services (cloud providers, CDNs, hosting platforms) can be claimed by attackers, enabling phishing, data theft, and reputational damage. It outlines common causes (orphaned services, expired third‑party accounts, migration oversights), potential impacts, detection tools (Amass, Subfinder, Subjack, Nuclei), prevention practices (regular DNS audits, registrar locking, certificate transparency monitoring, EASM) and a four‑step remediation playbook to verify, isolate, remove vulnerable DNS records, reclaim or reconfigure resources, and monitor for reinfection.