CVE-2026-53947

Ghost: Member existence leak via magic link sign-in response

State: Published
Severity: 5.3 Medium
Published: Jun 24, 2026
Updated: Jun 25, 2026
Reserved: Jun 11, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N	GitHub_M

Weaknesses

CWE-204 Observable Response Discrepancy

Affected Products

Product	Versions
GhostTryGhost	>= 5.18.0, < 6.21.1Affected

References

https://github.com/TryGhost/Ghost/security/advisories/GHSA-chgm-3698-jm42

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