{"id":"GHSA-chgm-3698-jm42","summary":"Ghost: Member existence leak via magic link sign-in response","details":"### Impact\n\nA 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.\n\n### Vulnerable versions\n\nThis vulnerability is present in Ghost from v5.18.0 up to v6.21.0.\n\n### Patches\n\nv6.21.1 contains a fix for this issue.\n\n### How to update\n\nFor 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). \n\nIf your Ghost is a Ghost-CLI install see our documentation on [updating it to the latest version here](https://docs.ghost.org/update). \n\n### For more information\n\nIf you have any questions or comments about this advisory, email Ghost at [security@ghost.org](mailto:security@ghost.org).","aliases":["BIT-ghost-2026-53947","CVE-2026-53947"],"modified":"2026-08-04T22:00:24.102958777Z","published":"2026-08-04T21:56:13Z","database_specific":{"github_reviewed_at":"2026-08-04T21:56:13Z","nvd_published_at":"2026-06-24T19:17:12Z","cwe_ids":["CWE-204"],"severity":"MODERATE","github_reviewed":true},"references":[{"type":"WEB","url":"https://github.com/TryGhost/Ghost/security/advisories/GHSA-chgm-3698-jm42"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53947"},{"type":"WEB","url":"https://github.com/TryGhost/Ghost/pull/26752"},{"type":"WEB","url":"https://github.com/TryGhost/Ghost/commit/fb2bb634653d99de68fc42d415721d755284fe30"},{"type":"PACKAGE","url":"https://github.com/TryGhost/Ghost"},{"type":"WEB","url":"https://github.com/TryGhost/Ghost/releases/tag/v6.21.1"}],"affected":[{"package":{"name":"ghost","ecosystem":"npm","purl":"pkg:npm/ghost"},"ranges":[{"type":"SEMVER","events":[{"introduced":"5.18.0"},{"fixed":"6.21.2"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-chgm-3698-jm42/GHSA-chgm-3698-jm42.json","last_known_affected_version_range":"\u003c 6.21.1"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"}]}