EUVD-2026-39025Severity by source
AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
SSRF to internal services creates realistic confidentiality exposure (C:L rather than vendor C:N); all other metrics retain the network-accessible, zero-auth, scope-changed baseline.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Lifecycle Timeline
2DescriptionCVE.org
Ghost is a Node.js content management system. From 6.0.9 until 6.21.1, when making an external request, it is possible to bypass the IP filter that ensures the request isn't going to an internal service using an IPv6 literal which maps to a private IPv4 address. This vulnerability is fixed in 6.21.1.
AnalysisAI
Server-side request forgery (SSRF) filter bypass in Ghost CMS 6.0.9 through 6.21.0 allows remote unauthenticated attackers to direct the application to reach internal network services by supplying IPv6 literals that map to private IPv4 addresses, circumventing Ghost's outbound IP blocklist. The root cause is CWE-184 (Incomplete List of Disallowed Inputs): the filter validates against RFC 1918 private ranges but does not normalize IPv6-mapped IPv4 notation before comparison. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the attacker can supply a URL to a Ghost feature that performs server-side outbound HTTP requests (such as bookmark/embed URL previews, newsletter fetches, or webhook configurations). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 5.8 (Medium) encodes AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An unauthenticated attacker identifies a Ghost feature that triggers server-side outbound HTTP requests - such as a URL preview, bookmark card, or webhook - and submits a URL using an IPv6-mapped private IPv4 literal (e.g., `http://[::ffff:169.254.169.254]/latest/meta-data/iam/security-credentials/`). Ghost's IP filter passes the address as non-private, the Node.js runtime connects to the cloud metadata service, and the attacker receives IAM credential material in the response. … |
| Remediation | Upgrade Ghost to version 6.21.1 or later; this is the vendor-confirmed patched release per advisory GHSA-wvp2-4qqp-4h3r (https://github.com/TryGhost/Ghost/security/advisories/GHSA-wvp2-4qqp-4h3r). … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-184 – Incomplete List of Disallowed Inputs
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External POC / Exploit Code
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