Vulnerability · Published Jun 24, 2026 · Assigned by GitHub_M

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

Medium 5.3

In plain English

A medium-severity security flaw in Ghost from TryGhost. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.3%top 71.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	ghost	6.21.2	GHSA-chgm-3698-jm42

Affected products (as reported)

Vendor	Product	Versions
TryGhost	Ghost	>= 5.18.0, < 6.21.1

Weakness: CWE-204 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References

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