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CVE-2026-53944— Ghost: Private IP filtering bypass to make server-side requests to internal services

Quick assessment

Affected
TryGhost Ghost
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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 6.0.9至6.21.1版本存在安全漏洞，该漏洞源于IP过滤绕过，可能导致攻击者利用映射到私有IPv4地址的IPv6地址绕过内部服务访问限制。

CVSS 5.8 · Medium EPSS 0.33% · P24

Affected Version Matrix 1

VendorProduct Version RangeStatus
TryGhost Ghost >= 6.0.9, < 6.21.1 affected
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I. Basic Information for CVE-2026-53944

Vulnerability Information
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Vulnerability Title
Ghost: Private IP filtering bypass to make server-side requests to internal services
Source: CVE Program / CVE List V5
Vulnerability Description
Ghost is a Node.js content management system. From 6.0.9 until 6.21.1, when making an external request, it is possible to bypass the IP filter that ensures the request isn't going to an internal service using an IPv6 literal which maps to a private IPv4 address. This vulnerability is fixed in 6.21.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不完整的黑名单
Source: CVE Program / CVE List V5
Vulnerability Title
Ghost 输入验证错误漏洞
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至6.21.1版本存在安全漏洞，该漏洞源于IP过滤绕过，可能导致攻击者利用映射到私有IPv4地址的IPv6地址绕过内部服务访问限制。
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 >= 6.0.9, < 6.21.1 -

II. Public POCs for CVE-2026-53944

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III. Intelligence Information for CVE-2026-53944

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Vendor Advisories for CVE-2026-53944 (1)

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

CVE-2026-53943 9.6 CRITICAL Ghost: Cache-poisoning XSS in Ghost frontend via x-ghost-preview header
CVE-2026-53950 7.5 HIGH @tryghost/activitypub: XSS in Ghost's ActivityPub client
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-184

V. Comments for CVE-2026-53944

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