{"schema_version":"1.9.0","id":"GHSA-r7f2-6fj8-6fg2","published":"2026-10-07T20:35:27Z","modified":"2026-10-07T20:45:07.138224252Z","aliases":["CVE-2026-105648"],"summary":"Ghost: Private IP Filtering Bypass via IPv6 Transition Addresses","details":"### Impact\n\nA validation issue allowed some functionality, such as Webmentions, to be abused by an unauthenticated user to make limited HTTP requests to hosts in the Ghost server's internal network on some network configurations. A successful attack would not result in any response data being returned.\n\n### Vulnerable versions\n\nThis vulnerability is present in Ghost from v6.0.9 up to v6.64.0.\n\n### Patches\n\nv6.65.0 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 [Nhat Anh Vu](https://github.com/nhattanhh) 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).","affected":[{"package":{"name":"ghost","ecosystem":"npm","purl":"pkg:npm/ghost"},"ranges":[{"type":"SEMVER","events":[{"introduced":"6.0.9"},{"fixed":"6.65.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-r7f2-6fj8-6fg2/GHSA-r7f2-6fj8-6fg2.json"}}],"references":[{"type":"WEB","url":"https://github.com/TryGhost/Ghost/security/advisories/GHSA-r7f2-6fj8-6fg2"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-105648"},{"type":"WEB","url":"https://github.com/TryGhost/Ghost/pull/30917"},{"type":"WEB","url":"https://github.com/TryGhost/Ghost/commit/20d3f792bf4a7c349ee56b746a067550d8684ff5"},{"type":"PACKAGE","url":"https://github.com/TryGhost/Ghost"},{"type":"WEB","url":"https://github.com/TryGhost/Ghost/releases/tag/v6.65.0"}],"database_specific":{"cwe_ids":["CWE-184","CWE-918"],"github_reviewed":true,"github_reviewed_at":"2026-10-07T20:35:27Z","nvd_published_at":"2026-10-05T20:17:13Z","severity":"MODERATE"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N"}]}