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CVE-2026-53947— Ghost: Member existence leak via magic link sign-in response

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 5.18.0版本至6.21.1之前版本存在信息泄露漏洞，该漏洞源于会员登录端点响应差异，可能导致未经身份验证的攻击者判断给定电子邮件地址是否属于已注册会员。

CVSS 5.3 · Medium EPSS 0.34% · P26

Possible ATT&CK Techniques 1 AI

T1204 · User Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
TryGhost Ghost >= 5.18.0, < 6.21.1 affected
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I. Basic Information for CVE-2026-53947

Vulnerability Information
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Vulnerability Title
Ghost: Member existence leak via magic link sign-in response
Source: CVE Program / CVE List V5
Vulnerability Description
Ghost is a Node.js content management system. From 5.18.0 until 6.21.1, a discrepancy in responses from the members signin endpoints made it possible for an unauthenticated attacker to determine whether a given email address belongs to a registered member of a Ghost site. 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:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
响应差异性信息暴露
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 5.18.0版本至6.21.1之前版本存在信息泄露漏洞，该漏洞源于会员登录端点响应差异，可能导致未经身份验证的攻击者判断给定电子邮件地址是否属于已注册会员。
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 >= 5.18.0, < 6.21.1 -

II. Public POCs for CVE-2026-53947

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III. Intelligence Information for CVE-2026-53947

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Vendor Advisories for CVE-2026-53947 (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-2026-53944 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-2026-53949 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-204

V. Comments for CVE-2026-53947

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