{"id":"CVE-2026-53949","aliases":["GHSA-jx35-x7fj-vgpr"],"title":"Ghost Content API filter bypass reveals private fields","summary":"Ghost Content API filter bypass reveals private fields","severity":"medium","cvss":5.3,"cwe":["CWE-200","CWE-693"],"vendor":"ghost","product":"ghost","ecosystem":"npm","affected":["ghost >= 5.46.1, < 6.21.2"],"patched":["ghost 6.21.2"],"published":"2026-08-05","updated":"2026-08-05","source":"GHSA","sourceUrl":"https://github.com/advisories/GHSA-jx35-x7fj-vgpr","references":[{"url":"https://github.com/TryGhost/Ghost/security/advisories/GHSA-jx35-x7fj-vgpr"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53949"},{"url":"https://github.com/TryGhost/Ghost/releases/tag/v6.21.2"},{"url":"https://github.com/advisories/GHSA-jx35-x7fj-vgpr"}],"tags":["ghsa","npm"],"epss":0.00358,"epssPercentile":0.29509,"ingestedAt":"2026-08-05T14:48:44.158Z","slug":"CVE-2026-53949","body":"## Overview\n\n### Impact\n\nThe validation applied to filters on the public API endpoints could be partially bypassed, making it possible to reveal private fields via a brute force attack. If SQLite was used as the database password hashes were fully accessible. If MySQL was used as the database the password hashes' case (uppercase / lowercase) would have been lost, which would likely have rendered a further brute force attack on the discovered hashes fruitless.\n\n### Vulnerable versions\n\nThis vulnerability is present in Ghost from v5.46.1 up to v6.21.1.\n\n### Patches\n\nv6.21.2 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### Workarounds\n\nIf upgrading immediately is not possible, block or filter requests to Content API endpoints where the `filter` query parameter contains `password` or `email` (including any compound form such as `users.password`, `users.email`, `authors.password`, `authors.email`). Reject requests at a reverse proxy / WAF layer before they reach Ghost.\n\nExample (case-insensitive) pattern to block on the raw querystring:\n\n```\nfilter=[^&]*(password|email)\n```\n\n### References\n\nGhost thanks crnkovic for disclosing this vulnerability responsibly.\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 >= 5.46.1, < 6.21.2`\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":[]}