EUVD-2026-39027
GHSA-62q6-4hv4-vjrw
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Network and unauthenticated (AV:N/PR:N) but gated by shared-cache and same-domain prerequisites plus victim cache retrieval (AC:H, UI:R); cache poisoning crosses trust boundary (S:C) enabling account takeover (C:H/I:H), with limited availability impact (A:L).
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Ghost is a Node.js content management system. From until 6.37.0, when Ghost is behind a shared caching layer that results in cached content being shared between different visitors, an unauthenticated user could send an x-ghost-preview header that altered the rendered frontend response. In affected cache configurations, that response could be stored and served to subsequent visitors requesting the same page, allowing cache poisoning of request-specific preview output. When running Ghost's frontend and admin panel on the same domain this could be used to take over staff user accounts. When running these on different domains staff accounts have no exposure. This vulnerability is fixed in 6.37.0.
Articles & Coverage 1
AnalysisAI
Web cache poisoning in the Ghost Node.js CMS before 6.37.0 lets an unauthenticated attacker inject an x-ghost-preview header that alters the rendered frontend response, which a shared caching layer then stores and serves to other visitors of the same page. When Ghost's public frontend and admin panel share a single domain, this request-specific preview output can be weaponized to hijack staff accounts; separate-domain deployments are not exposed. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires three concrete conditions drawn from the advisory: (1) Ghost must be deployed behind a shared caching layer that serves the same cached content to different visitors; (2) the attacker sends an unauthenticated request carrying the x-ghost-preview header, which alters the rendered frontend response; and (3) for staff-account takeover, Ghost's frontend and admin panel must run on the SAME domain. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H yields 9.6 (Critical), driven by network reach, no privileges, and a changed scope reflecting impact on cache-downstream victims and staff accounts. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker sends a request to a cacheable public page of a vulnerable Ghost site with a crafted x-ghost-preview header, causing the shared cache to store the altered, preview-influenced response under the normal URL. A staff user (or other visitors) subsequently loading that same page receives the poisoned content; on a same-domain frontend/admin deployment the attacker leverages this to take over the staff account. … |
| Remediation | Upgrade to Ghost 6.37.0, which fixes the issue (Vendor-released patch: 6.37.0); this is the primary and recommended remediation per advisory GHSA-62q6-4hv4-vjrw (https://github.com/TryGhost/Ghost/security/advisories/GHSA-62q6-4hv4-vjrw). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Audit all Ghost deployments to identify whether admin and public frontend share a domain. …
Sign in for detailed remediation steps and compensating controls.
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