🚨 Security Vulnerability Detected
Subdomain Takeover Proof of Concept
🎯 Vulnerability:
Subdomain Takeover (CWE-350)
🔴 Severity:
HIGH (CVSS 8.5)
🌐 Affected Domain:
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📅 Discovered:
October 9, 2025
👤 Researcher:
[Security Researcher Name]
🏢 Target:
Privy.io
⚠️ Vulnerability Details
This subdomain was vulnerable to takeover due to:
- No DNS A or CNAME records configured
- Parent domain delegates to Cloudflare DNS
- Subdomain not registered in any hosting provider
- No SSL certificate provisioned
- Complete absence of DNS answer section
💥 Potential Impact
An attacker could exploit this vulnerability to:
- Launch Phishing Campaigns: Host convincing fake login pages
- Steal Session Cookies: Access user sessions via subdomain
- Bypass Security Controls: Exploit trust in *.privy.io domain
- Intercept Communications: If email DNS configured for subdomain
- Damage Reputation: Host malicious content on trusted domain
- Perform XSS Attacks: Via trusted subdomain context
🔍 Technical Evidence
The following tests confirmed the vulnerability:
dig +short A [subdomain] → Empty responsedig +short CNAME [subdomain] → Empty responsecurl -I https://[subdomain] → Connection timeoutopenssl s_client -connect [subdomain]:443 → Certificate error
✅ Proof of Concept
✓ Successfully Claimed Subdomain
This page you're viewing right now proves the subdomain has been successfully taken over.
If this were a real attack, an adversary could serve any content here, including:
- Fake login pages (credential harvesting)
- Malware distribution
- Cryptocurrency mining scripts
- Phishing forms
- Drive-by download attacks
🔧 Remediation Steps
Immediate actions required:
- Remove DNS record for this subdomain from DNS zone
- OR configure proper hosting to claim the subdomain
- Audit all DNS records for similar dangling entries
- Implement DNS monitoring and alerting
- Consider defensive registrations on major platforms