{"id":"GHSA-wvp2-4qqp-4h3r","revision":"22534495662145e2b8dc7bcf95d3e37e","records":[{"revision":"22534495662145e2b8dc7bcf95d3e37e","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-wvp2-4qqp-4h3r","aliases":["BIT-ghost-2026-53944","CVE-2026-53944"],"title":"Ghost: Private IP filtering bypass to make server-side requests to internal services","description":"### Impact\n\nWhen making an external request, it is possible to bypass the IP filter that ensures the request isn't going to an internal service using an IPv6 literal which maps to a private IPv4 address.\n\n### Vulnerable versions\n\nThis vulnerability is present in Ghost from v6.0.9 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### References\n\nGhost thanks [l3tchupkt](http://github.com/l3tchupkt) for disclosing this vulnerability responsibly.\n\n### For more information\n\nIf you have any questions or comments about this advisory, email us at [security@ghost.org](mailto:security@ghost.org).","state":0,"publishedAt":"2026-08-04T21:13:16+00:00","modifiedAt":"2026-08-04T21:30:19.8586347+00:00","affected":[{"ecosystem":"npm","name":"ghost","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"6.0.9"},{"kind":"fixed","version":"6.21.1"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/TryGhost/Ghost/security/advisories/GHSA-wvp2-4qqp-4h3r","https://nvd.nist.gov/vuln/detail/CVE-2026-53944","https://github.com/TryGhost/Ghost/pull/26749","https://github.com/TryGhost/Ghost/commit/9b7f2212970fade08ecbec543b405190471e38d4","https://github.com/TryGhost/Ghost","https://github.com/TryGhost/Ghost/releases/tag/v6.21.1"],"sourceUrl":"https://github.com/advisories/GHSA-wvp2-4qqp-4h3r","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-wvp2-4qqp-4h3r","identifiers":["GHSA-wvp2-4qqp-4h3r","BIT-ghost-2026-53944","CVE-2026-53944"]},"retained":false,"historicalAffected":[]}],"coverage":[]}