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

2026-10-07T14:05:24.618903+00:00

Affected: Bitnami: ghost

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.

EUVD-2026-330344

2026-10-07T14:05:24.618949+00:00

EUVD-2026-330344

fkie_cve-2026-53947

2026-10-07T14:05:24.618965+00:00

GHSA-chgm-3698-jm42 — Ghost: Member existence leak via magic link sign-in response

2026-10-07T14:05:24.618988+00:00

Affected: npm: ghost

### Impact

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.

### Vulnerable versions

This vulnerability is present in Ghost from v5.18.0 up to v6.21.0.

### Patches

v6.21.1 contains a fix for this issue.

### How to update

For self-hosters using Docker, find [Docker's official Ghost image here](https://hub.docker.com/_/ghost). Updating a Docker-based Ghost instance [is documented here](https://docs.ghost.org/install/docker#updating-ghost).

If your Ghost is a Ghost-CLI install see our documentation on [updating it to the latest version here](https://docs.ghost.org/update).

### For more information

If you have any questions or comments about this advisory, email Ghost at [security@ghost.org](mailto:security@ghost.org).