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CVE-2026-53945— Ghost: Server-side request forgery via DNS rebinding in external request handling

CVSS 4.0 · Medium EPSS 0.14% · P4

Affected Version Matrix 1

VendorProductVersion RangeStatus
TryGhostGhost>= 6.0.9, < 6.21.1affected
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I. Basic Information for CVE-2026-53945

Vulnerability Information
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Vulnerability Title
Ghost: Server-side request forgery via DNS rebinding in external request handling
Source: CVE Program / CVE List V5
Vulnerability Description
Ghost is a Node.js content management system. From 6.0.9 until 6.21.1, Ghost’s private-IP check for outbound HTTP requests could be bypassed via DNS rebinding, allowing an attacker to coerce the Ghost server into reaching hosts on internal networks through features that issue external fetches. This vulnerability is fixed in 6.21.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5
Vulnerability Title
Ghost 竞争条件问题漏洞
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 6.0.9版本至6.21.1之前版本存在安全漏洞，该漏洞源于私有IP检查可被DNS重绑定绕过，可能导致攻击者通过发起外部请求的功能访问内部网络主机。
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

VendorProductAffected VersionsCPESubscribe
TryGhostGhost >= 6.0.9, < 6.21.1 -

II. Public POCs for CVE-2026-53945

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III. Intelligence Information for CVE-2026-53945

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Vendor Advisories for CVE-2026-53945 (1)

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

CVE-2026-539439.6 CRITICALGhost: Cache-poisoning XSS in Ghost frontend via x-ghost-preview header
CVE-2026-539507.5 HIGH@tryghost/activitypub: XSS in Ghost's ActivityPub client
CVE-2026-539445.8 MEDIUMGhost: Private IP filtering bypass to make server-side requests to internal services
CVE-2026-539485.4 MEDIUMGhost: File Upload Content-Type Spoofing
CVE-2026-539465.4 MEDIUMGhost: Mobiledoc image-size fetch SSRF
CVE-2026-539475.3 MEDIUMGhost: Member existence leak via magic link sign-in response
CVE-2026-539495.3 MEDIUMGhost Content API filter bypass reveals private fields

IV. Related Vulnerabilities

Same product: Ghost
Same vendor: TryGhost
Same weakness: CWE-367

V. Comments for CVE-2026-53945

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