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- That Forgotten Subdomain Could Become Someone Else’s Website
That Forgotten Subdomain Could Become Someone Else’s Website
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Old Infrastructure Leaves Digital Footprints Behind
Teams regularly create subdomains for campaigns, staging environments, documentation, customer portals, and temporary projects. The project disappears — but its DNS record may remain.
Abandoned DNS Records Can Become Dangerous
If a subdomain still points to a third-party service that your organization no longer controls, an attacker may be able to claim the abandoned resource and serve content from your trusted domain.
Your Brand Gives the Attack Credibility
A malicious page hosted under a legitimate company subdomain can appear far more trustworthy than an unfamiliar domain, making phishing and credential theft more convincing.
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Temporary Projects Create Permanent Exposure
Marketing campaigns, proof-of-concepts, developer environments, and discontinued SaaS tools are especially easy to forget once ownership changes or teams move on.
Asset Inventories Need to Include DNS
Security teams should know which subdomains exist, where they point, who owns them, and whether the underlying service is still active.
Decommission Infrastructure Completely
When retiring a service, remove associated DNS records, certificates, cloud resources, integrations, and credentials. Creating infrastructure is only half the lifecycle — securely deleting it matters just as much.
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