EUVD-2026-39024Severity by source
AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
DNS rebinding requires no auth but demands DNS control and timing precision (AC:H); SSRF-class internal access implies at least low confidentiality impact (C:L) from probing internal service responses.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:3.1/AV:N/AC:H/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, Ghost’s private-IP check for outbound HTTP requests could be bypassed via DNS rebinding, allowing an attacker to coerce the Ghost server into reaching hosts on internal networks through features that issue external fetches. This vulnerability is fixed in 6.21.1.
AnalysisAI
DNS rebinding bypasses Ghost CMS's private-IP validation for outbound HTTP requests, enabling server-side request forgery (SSRF) against internal network resources. Versions 6.0.9 through 6.21.0 are affected; the root cause is a TOCTOU race (CWE-367) between Ghost's allowlist check and the actual TCP connection, which a DNS-rebinding attacker exploits by switching DNS records between check-time and connect-time. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must be able to trigger a Ghost feature that issues an outbound HTTP request to an attacker-controlled hostname - examples include configuring a webhook URL, submitting an RSS feed URL for import, or invoking a custom integration. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The official CVSS 3.1 score is 4.0 with vector AV:N/AC:H/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 attacker registers a domain and configures its authoritative DNS to serve a public IP with an extremely short TTL. They trigger a Ghost feature (such as a webhook endpoint or integration fetch) pointing at that domain; Ghost resolves the name, sees a public IP, and passes its private-IP check. … |
| Remediation | Upgrade to Ghost 6.21.1 or later, which contains the vendor-released fix per advisory GHSA-ch52-px8q-f22j at https://github.com/TryGhost/Ghost/security/advisories/GHSA-ch52-px8q-f22j. … Detailed patch versions, workarounds, and compensating controls in full report. |
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