Forgotten subdomains boost risk of account hijacking, other attacks
Subdomains that once served a purpose but later were forgotten by website administrators can be abused by hackers to attack users of sites under the same main domain.
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Abandoned subdomains pose security risk for businesses
Many companies set up subdomains for use with external services, but then forget to disable them when they stop using those services, creating a loophole for attackers to exploit.