HubSpot Takeover Detection Scanner

HubSpot is a comprehensive inbound marketing, sales, and customer service platform used by businesses of all sizes to manage customer relationships, automate marketing campaigns, and track sales pipelines. Marketing teams, sales departments, and customer service representatives rely on HubSpot to streamline communication, analyze website traffic, and nurture leads. Its cloud-based tools include email tracking, deal management, and analytics dashboards that integrate with various third-party services. HubSpot's primary goal is to help businesses grow by improving customer engagement and operational efficiency through a unified interface.

Subdomain takeover is a security vulnerability that occurs when a DNS CNAME record points to a service (like HubSpot) that is no longer active or properly configured. This allows an attacker to claim the subdomain by registering the same service on the same platform. The vulnerability arises when organizations fail to remove or update DNS records after decommissioning a HubSpot integration or page. Attackers can exploit this by creating a new HubSpot account and linking it to the dangling subdomain, effectively taking control of it.

Technically, the scanner checks for HubSpot-specific CNAME records that resolve to domains like 'hubspot.com' or 'hs-sites.com' but are not actively managed. It sends HTTP requests to the target subdomain and analyzes the response for HubSpot error pages or default landing pages that indicate the subdomain is unclaimed. If the response contains a HubSpot-branded 404 or setup page, the subdomain is likely vulnerable to takeover. The scanner also verifies DNS propagation and TTL values to confirm the misconfiguration.

If exploited, an attacker can host phishing pages, malware, or fraudulent content under the legitimate subdomain, damaging the organization's reputation and trust. They could also intercept cookies, credentials, or other sensitive data from users visiting the compromised subdomain. This can lead to data breaches, financial loss, and regulatory penalties. The impact is amplified because the subdomain appears legitimate to users and search engines, making detection difficult without active monitoring.