GHSA-R7F2-6FJ8-6FG2

Vulnerability from github – Published: 2026-10-07 20:35 – Updated: 2026-10-07 20:35
VLAI
Summary
Ghost: Private IP Filtering Bypass via IPv6 Transition Addresses
Details

Impact

A 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.

Vulnerable versions

This vulnerability is present in Ghost from v6.0.9 up to v6.64.0.

Patches

v6.65.0 contains a fix for this issue.

How to update

For self-hosters using Docker, find Docker's official Ghost image here. Updating a Docker-based Ghost instance is documented here.

If your Ghost is a Ghost-CLI install see our documentation on updating it to the latest version here.

References

Ghost thanks Nhat Anh Vu for disclosing this vulnerability responsibly.

For more information

If you have any questions or comments about this advisory, email us at security@ghost.org.

Severity
4.0 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "ghost"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.0.9"
            },
            {
              "fixed": "6.65.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-105648"
  ],
  "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"
  },
  "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\u0027s 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\u0027s 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).",
  "id": "GHSA-r7f2-6fj8-6fg2",
  "modified": "2026-10-07T20:35:27Z",
  "published": "2026-10-07T20:35:27Z",
  "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Ghost: Private IP Filtering Bypass via IPv6 Transition Addresses"
}



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Sightings

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Nomenclature

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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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