GHSA-chgm-3698-jm42

Source

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

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-chgm-3698-jm42/GHSA-chgm-3698-jm42.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-chgm-3698-jm42

Aliases

Published

2026-08-04T21:56:13Z

Modified

2026-08-04T22:00:24Z

Severity

5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N CVSS Calculator

Summary

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

Details

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. Updating a Docker-based Ghost instance is documented here.

If your Ghost is a Ghost-CLI install see our documentation on updating it to the latest version here.

For more information

If you have any questions or comments about this advisory, email Ghost at security@ghost.org.

Database specific

{
    "cwe_ids": [
        "CWE-204"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-04T21:56:13Z",
    "nvd_published_at": "2026-06-24T19:17:12Z",
    "severity": "MODERATE"
}

References

Affected packages

npm / ghost

Package

Name: ghost; View open source insights on deps.dev
Purl: pkg:npm/ghost

Affected ranges

Type: SEMVER
Events: Introduced

5.18.0

Fixed

6.21.2

Database specific

last_known_affected_version_range

"< 6.21.1"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-chgm-3698-jm42/GHSA-chgm-3698-jm42.json"