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CVE-2026-53943— Ghost: Cache-poisoning XSS in Ghost frontend via x-ghost-preview header

Quick assessment

Affected
TryGhost Ghost
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Ghost是Ghost基金会开源的一款内容管理平台。 Ghost 4.0.0版本至6.37.0之前版本存在信息泄露漏洞，该漏洞源于共享缓存层导致的缓存内容被不同访客共享，可能允许未经身份验证的用户发送x-ghost-preview标头改变前端响应，导致缓存投毒。

CVSS 9.6 · Critical EPSS 0.45% · P37

Affected Version Matrix 1

VendorProduct Version RangeStatus
TryGhost Ghost >= 4.0.0, < 6.37.0 affected
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I. Basic Information for CVE-2026-53943

Vulnerability Information
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Vulnerability Title
Ghost: Cache-poisoning XSS in Ghost frontend via x-ghost-preview header
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
通过缓存导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Ghost 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Ghost是Ghost基金会开源的一款内容管理平台。 Ghost 4.0.0版本至6.37.0之前版本存在信息泄露漏洞，该漏洞源于共享缓存层导致的缓存内容被不同访客共享，可能允许未经身份验证的用户发送x-ghost-preview标头改变前端响应，导致缓存投毒。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
TryGhost Ghost >= 4.0.0, < 6.37.0 -

II. Public POCs for CVE-2026-53943

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 9052 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-53943

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Vendor Advisories for CVE-2026-53943 (1)

Same Patch Batch · TryGhost · 2026-06-24 · 8 CVEs total

CVE-2026-53950 7.5 HIGH @tryghost/activitypub: XSS in Ghost's ActivityPub client
CVE-2026-53944 5.8 MEDIUM Ghost: Private IP filtering bypass to make server-side requests to internal services
CVE-2026-53948 5.4 MEDIUM Ghost: File Upload Content-Type Spoofing
CVE-2026-53946 5.4 MEDIUM Ghost: Mobiledoc image-size fetch SSRF
CVE-2026-53947 5.3 MEDIUM Ghost: Member existence leak via magic link sign-in response
CVE-2026-53949 5.3 MEDIUM Ghost Content API filter bypass reveals private fields
CVE-2026-53945 4.0 MEDIUM Ghost: Server-side request forgery via DNS rebinding in external request handling

IV. Related Vulnerabilities

Same product: Ghost
Same vendor: TryGhost
Same weakness: CWE-524

V. Comments for CVE-2026-53943

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