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CWE-524Weakness · CWE-524

CVE-2026-53943

CRITICAL · 9.6 CVSS v3.1 Published 2026-06-24
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

A cache poisoning vulnerability in Ghost CMS allows unauthenticated attackers to inject a malicious x-ghost-preview header that gets cached and served to subsequent visitors. When Ghost's frontend and admin panel run on the same domain, this can lead to staff account takeover by poisoning preview output that executes in the context of legitimate admin sessions.

MitigationUpgrade to Ghost 6.37.0 or later. If immediate upgrade is not feasible, ensure frontend and admin panel run on separate domains to eliminate the account takeover vector, and review cache configuration to prevent caching of responses containing the x-ghost-preview header.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Check installed Ghost CMS version
    Run 'ghost version' in the Ghost installation directory, or check the package.json file, or view the version in the admin panel under Settings > About
    Affected if Version is earlier than 6.37.0
  2. Verify domain configuration for frontend and admin
    Inspect the Ghost configuration file (config.production.json or config.development.json) and compare the 'url' setting with the 'admin' > 'url' setting to determine if they share the same domain
    Affected if Frontend URL and admin URL use the same domain
  3. Examine caching of preview responses
    Review your caching configuration (e.g., reverse proxy settings, Redis, CDN, or file-based cache) and check whether HTTP responses containing the x-ghost-preview header are being cached and served to subsequent visitors
    Affected if Cache is storing responses that include the x-ghost-preview header from unauthenticated requests

You are affected if Ghost version is below 6.37.0 and the frontend and admin panel run on the same domain with caching enabled for preview headers.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Upgrade to Ghost 6.37.0 or later. If immediate upgrade is not feasible, ensure frontend and admin panel run on separate domains to eliminate the account takeover vector, and review cache configuration to prevent caching of responses containing the x-ghost-preview header.

Recommended fix High confidence

Upgrade to Ghost 6.37.0 or later

  1. Upgrade Ghost to version 6.37.0 or later to resolve the cache poisoning vulnerability
  2. Verify the upgrade was successful by checking the Ghost version after installation
  3. If using a shared caching layer (e.g., Varnish, CDN, nginx caching), ensure the x-ghost-preview header is either not cached or stripped at the cache level
  4. Consider running Ghost's frontend and admin panel on separate domains as an additional hardening measure (though not required post-fix)
Caveat Review any custom integrations that rely on the x-ghost-preview header behavior, as the fix may alter that functionality

Generated from the published advisory — verify against the referenced sources before acting.

Have this fixed Scoped from the published advisory
  • Consultation3.0 h
  • Implementation2.0 h
  • Testing4.0 h
  • Review / QA2.0 h
11.0 hours of engineering $1,920
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-53943 in production — separate from our analysis above.

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