CVE-2026-53943: CWE-524: Use of Cache Containing Sensitive Information in TryGhost Ghost
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.
AI Analysis
Technical Summary
CVE-2026-53943 is a cache poisoning vulnerability in TryGhost Ghost CMS versions before 6.37.0. It arises when Ghost is behind a shared caching layer that caches responses across different visitors. An attacker can send an x-ghost-preview header to modify the rendered frontend response, which may then be cached and served to subsequent visitors, leaking request-specific preview content. This can lead to severe impact including staff user account takeover if the frontend and admin panel share the same domain. The vulnerability is addressed in Ghost 6.37.0.
Potential Impact
The vulnerability allows unauthenticated attackers to poison cached frontend responses by exploiting shared caching layers, potentially exposing sensitive preview content to other users. When the frontend and admin panel run on the same domain, this can escalate to full staff user account takeover. The CVSS score of 9.6 reflects critical impact with high confidentiality, integrity, and availability consequences.
Mitigation Recommendations
Upgrade Ghost to version 6.37.0 or later, where this vulnerability is fixed. Until then, avoid deploying Ghost behind shared caching layers that share cached content between different visitors, or separate the frontend and admin panel domains to reduce risk. Patch status is confirmed fixed in 6.37.0.
CVE-2026-53943: CWE-524: Use of Cache Containing Sensitive Information in TryGhost Ghost
Description
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.
CVSS v3.1
Score 9.6critical
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-53943 is a cache poisoning vulnerability in TryGhost Ghost CMS versions before 6.37.0. It arises when Ghost is behind a shared caching layer that caches responses across different visitors. An attacker can send an x-ghost-preview header to modify the rendered frontend response, which may then be cached and served to subsequent visitors, leaking request-specific preview content. This can lead to severe impact including staff user account takeover if the frontend and admin panel share the same domain. The vulnerability is addressed in Ghost 6.37.0.
Potential Impact
The vulnerability allows unauthenticated attackers to poison cached frontend responses by exploiting shared caching layers, potentially exposing sensitive preview content to other users. When the frontend and admin panel run on the same domain, this can escalate to full staff user account takeover. The CVSS score of 9.6 reflects critical impact with high confidentiality, integrity, and availability consequences.
Mitigation Recommendations
Upgrade Ghost to version 6.37.0 or later, where this vulnerability is fixed. Until then, avoid deploying Ghost behind shared caching layers that share cached content between different visitors, or separate the frontend and admin panel domains to reduce risk. Patch status is confirmed fixed in 6.37.0.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-11T15:50:01.280Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a3c2387748d17fc4ff2f760
Added to database: 06/24/2026, 18:35:51 UTC
Last enriched: 07/01/2026, 22:49:57 UTC
Last updated: 08/08/2026, 12:41:11 UTC
Views: 72
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