{"id":"CVE-2026-53947","aliases":["BIT-ghost-2026-53947","GHSA-chgm-3698-jm42"],"url":"https://o3.security/vulnerability/CVE-2026-53947","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).","published":"2026-06-24T18:07:42.965Z","modified":"2026-10-28T02:30:59.904106479Z","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"ghost","fixedVersion":"6.21.2"}],"fix":{"url":"https://github.com/TryGhost/Ghost/pull/26752","label":"TryGhost/Ghost#26752"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53947.json"},{"type":"ADVISORY","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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:30:59.904106479Z"}}