VulnerabilityDeferred

CVE-2026-53947

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.

MEDIUM 5.3EPSS 0.34%

Does this matter?

Lower severity and a low EPSS score (0.34%). Track it; it rarely justifies an emergency change on its own.

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.

CVSS 3.1: 5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS: 0.34% probability · 28th percentile
CISA KEV: Not listed
Weakness: CWE-204
Source: security-advisories@github.com

References

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

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.