TryGhost up to 6.36.x Configuration cache containing sensitive information

Summaryinfo

A vulnerability, which was classified as critical, was found in TryGhost Ghost up to 6.36.x. This vulnerability affects unknown code of the component Configuration Handler. Such manipulation leads to use of cache containing sensitive information. This vulnerability is listed as CVE-2026-53943. The attack may be performed from remote. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in TryGhost Ghost up to 6.36.x. It has been rated as critical. Affected by this issue is some unknown functionality of the component Configuration Handler. The manipulation with an unknown input leads to a use of cache containing sensitive information vulnerability. Using CWE to declare the problem leads to CWE-524. The code uses a cache that contains sensitive information, but the cache can be read by an actor outside of the intended control sphere. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-53943 since 06/11/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1592.

Upgrading to version 6.37.0 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• TryGhost

Name

• Ghost

Version

• 6.0
• 6.1
• 6.2
• 6.3
• 6.4
• 6.5
• 6.6
• 6.7
• 6.8
• 6.9
• 6.10
• 6.11
• 6.12
• 6.13
• 6.14
• 6.15
• 6.16
• 6.17
• 6.18
• 6.19
• 6.20
• 6.21
• 6.22
• 6.23
• 6.24
• 6.25
• 6.26
• 6.27
• 6.28
• 6.29
• 6.30
• 6.31
• 6.32
• 6.33
• 6.34
• 6.35
• 6.36

Website

• Product: https://github.com/TryGhost/Ghost/

CPE 2.3info

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Once again VulDB remains the best source for vulnerability data.

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