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The vulnerability resides in the oEmbed bookmark feature’s handling of user-supplied URLs. When a staff user embeds a bookmark, the backend server fetches the provided URL to generate a preview. The mechanism fails to properly validate and restrict the URL scheme or the destination IP address. This allows an attacker to craft a malicious bookmark link pointing to internal, non-routable, or restricted systems within the network (e.g., 127.0.0.1, 169.254.169.254 for cloud metadata). The Ghost server, acting on the attacker’s instruction, performs the HTTP request and returns the response, enabling data exfiltration from internal services that would otherwise be inaccessible.
Platform: Ghost CMS
Version: 5.99.0-5.130.3, 6.0.0-6.0.8
Vulnerability: SSRF
Severity: Critical
date: 2025-09-15
Prediction: Patch released
What Undercode Say:
`curl -H “Content-Type: application/json” -d ‘{“url”:”http://169.254.169.254/latest/meta-data/”}’ http://ghost.local/ghost/api/admin/oembed/
`nmap -sT 127.0.0.1 -p 1-65535
`ifconfig eth0
How Exploit:
Craft oEmbed bookmark with internal URL. Submit to trigger server-side request. Retrieve sensitive data from response.
Protection from this CVE
Update to v5.130.4 or v6.0.9. Implement network segmentation. Enforce strict URL validation and allowlisting for outbound requests.
Impact:
Internal network data exfiltration. Potential cloud metadata access. Bypass of firewall controls.
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Sources:
Reported By: github.com
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