---
id: CVE-2026-53947
aliases:
  - GHSA-chgm-3698-jm42
title: 'Ghost: Member existence leak via magic link sign-in response'
summary: 'Ghost: Member existence leak via magic link sign-in response'
severity: medium
cvss: 5.3
cwe:
  - CWE-204
vendor: ghost
product: ghost
ecosystem: npm
affected:
  - 'ghost >= 5.18.0, < 6.21.1'
patched:
  - ghost 6.21.2
published: '2026-08-04'
updated: '2026-08-04'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-chgm-3698-jm42'
references:
  - url: 'https://github.com/TryGhost/Ghost/security/advisories/GHSA-chgm-3698-jm42'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-53947'
  - url: 'https://github.com/TryGhost/Ghost/pull/26752'
  - url: >-
      https://github.com/TryGhost/Ghost/commit/fb2bb634653d99de68fc42d415721d755284fe30
  - url: 'https://github.com/TryGhost/Ghost/releases/tag/v6.21.1'
  - url: 'https://github.com/advisories/GHSA-chgm-3698-jm42'
tags:
  - ghsa
  - npm
epss: 0.00345
epssPercentile: 0.25281
ingestedAt: '2026-08-04T22:42:37.884Z'
---

## Overview

### 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).

## Affected packages

- `ghost >= 5.18.0, < 6.21.1`

## Remediation

Upgrade to a patched release:

- `ghost 6.21.2`