CVE-2026-53943: Tryghost Ghost

Critical severity, CVSS 9.6. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Tryghost Ghost: from 4.0.0, before 6.37.0 (fixed in 6.37.0)

Published 2026-06-24. Last modified 2026-06-25.