What risk does a dangling HubSpot CNAME present?

HIGH SEVERITYCMSCVSS 8.2Requires Account VerificationID: hubspot-cms

HubSpot CMS Dangling DNS & Takeover Fingerprint

HubSpot marketing page CNAME was unlinked from a portal while DNS remains active.

DNS CNAME Delegation Rules

Target CNAME Delegation

*.hubspotpagebuilder.net

DNS Resolution Indicator

CNAME points to hubspotpagebuilder.net. Returns 404 'Domain not mapped'.

Expected HTTP Status Code

404 Not Found

Authoritative Response Token

Vulnerable Body Indicator String

“Domain not mapped”

CLI Verification Command

curl -sI http://subdomain.example.com | grep 'Domain not mapped'

When SubdomainWatch scanner identifies this response on an unresolved CNAME target, an automated alert is triggered within 800ms.

Remediation Guide & Defensive Action Plan

Immediate Action Required: Delete the HubSpot CNAME record in DNS.

Defensive Verification Checklist:

Audit authoritative DNS zone records for any CNAME pointing to *.hubspotpagebuilder.net.
Verify whether the target resource or bucket still exists under your organization's cloud tenant.
If decommissioned, delete the DNS record immediately to close the public exposure window.
Deploy a pre-merge IaC security gate (such as SubdomainWatch Takeover Guard) to intercept dangling records before pull requests merge.

Terraform Remediation Example

# Delete HubSpot pagebuilder CNAME

Open Dedicated HubSpot CMS Terraform Solution Guide →

ATTACK SURFACE DETECTION COMPARISON

Why Static DNS Scanners Miss HubSpot CMS Takeovers

Passive DNS repositories like SecurityTrails and heavy scanners like Detectify record domain records retrospectively or trigger alert fatigue. SubdomainWatch conducts active recursive CNAME testing with zero false positives.

SubdomainWatch vs SecurityTrails →SubdomainWatch vs Detectify →All 5 Competitor Benchmarks →

HubSpot CMS Takeover FAQs

Attackers can map landing pages with corporate branding to capture lead submissions and credentials.

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