{"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":0.27981,"ingestedAt":"2026-08-04T22:42:37.884Z","slug":"CVE-2026-53947","body":"## Overview\n\n### 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).\n\n## Affected packages\n\n- `ghost >= 5.18.0, < 6.21.1`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `ghost 6.21.2`","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}