CVE-2026-53947 | Ghost is a Node.js content management system. From 5.18.0 un… | CVSS 5.3 MEDIUM

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.

Metadata

CVE ID: CVE-2026-53947
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-06-11 15:50 UTC
Published: 2026-06-24 18:07 UTC
Last updated: 2026-06-24 18:07 UTC
Primary CWE: CWE-204
CWE-204: Observable Response Discrepancy
Vendor / Product: TryGhost / Ghost
Sources: cve.org · NVD

Severity & Metrics

5.3 MEDIUM CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products (1)

Vendor	Product	Platform	Versions
TryGhost	Ghost	—	>= 5.18.0, < 6.21.1

Weakness (CWE)

CWE	Source	Description
CWE-204	cna	CWE-204: Observable Response Discrepancy

CVSS scores (1)

Score	Severity	Version	Source	Vector
5.3	MEDIUM	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References (1)

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