GHSA-XM43-3M56-W3WF

Vulnerability from github – Published: 2026-08-04 21:57 – Updated: 2026-08-04 21:57
VLAI
Summary
Ghost: Paid gift memberships obtainable at minimal cost via the donations feature
Details

Impact

A vulnerability in Ghost's public donation checkout flow allowed an unauthenticated attacker to obtain full paid gift memberships for a minimal payment. No customer or member data was exposed, and the issue could not be used to steal money from a site or its members.

Vulnerable versions

This vulnerability is present in Ghost from v6.27.0 up to v6.43.1.

Patches

v6.44.0 contains a fix for this issue.

How to update

For self-hosters using Docker, find Docker’s official Ghost image on Docker Hub and follow the documentation on updating a Docker-based Ghost instance.

For self-hosters using Ghost-CLI, see the documentation for updating Ghost to the latest version.

Workarounds

If upgrading immediately is not possible, you can remove the vulnerable checkout path by disabling the donations feature in Ghost Admin under Settings → Membership → Tips & donations until the upgrade is applied.

References

Ghost thanks sane100400 and p4p3r for disclosing this vulnerability responsibly.

For more information

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

Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "ghost"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.27.0"
            },
            {
              "fixed": "6.44.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-59817"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-472",
      "CWE-639"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-04T21:57:48Z",
    "nvd_published_at": "2026-07-09T18:16:57Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\n\nA vulnerability in Ghost\u0027s public donation checkout flow allowed an unauthenticated attacker to obtain full paid gift memberships for a minimal payment. No customer or member data was exposed, and the issue could not be used to steal money from a site or its members.\n\n### Vulnerable versions\n\nThis vulnerability is present in Ghost from [v6.27.0](https://github.com/TryGhost/Ghost/releases/tag/v6.27.0) up to [v6.43.1](https://github.com/TryGhost/Ghost/releases/tag/v6.43.1).\n\n### Patches\n\n[v6.44.0](https://github.com/TryGhost/Ghost/releases/tag/v6.44.0) contains a fix for this issue. \n\n### How to update\n\nFor self-hosters using Docker, find [Docker\u2019s official Ghost image on Docker Hub](https://hub.docker.com/_/ghost) and follow the documentation on [updating a Docker-based Ghost instance](https://docs.ghost.org/install/docker#updating-ghost).\n\nFor self-hosters using Ghost-CLI, see the documentation for [updating Ghost to the latest version](https://docs.ghost.org/update).\n\n### Workarounds\n\nIf upgrading immediately is not possible, you can remove the vulnerable checkout path by disabling the donations feature in Ghost Admin under Settings \u2192 Membership \u2192 Tips \u0026 donations until the upgrade is applied.\n\n### References\n\nGhost thanks sane100400 and [p4p3r](https://hackerone.com/p4p3r_hak) 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).",
  "id": "GHSA-xm43-3m56-w3wf",
  "modified": "2026-08-04T21:57:48Z",
  "published": "2026-08-04T21:57:48Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/TryGhost/Ghost/security/advisories/GHSA-xm43-3m56-w3wf"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-59817"
    },
    {
      "type": "WEB",
      "url": "https://github.com/TryGhost/Ghost/pull/28351"
    },
    {
      "type": "WEB",
      "url": "https://github.com/TryGhost/Ghost/pull/28352"
    },
    {
      "type": "WEB",
      "url": "https://github.com/TryGhost/Ghost/commit/cab716cd015ac04b7ee50c7a405478d97bc7b1e0"
    },
    {
      "type": "WEB",
      "url": "https://github.com/TryGhost/Ghost/commit/ee7b991b466a7849c70f9d1caed8e491ee4113c6"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/TryGhost/Ghost"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Ghost: Paid gift memberships obtainable at minimal cost via the donations feature"
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • 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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.


Detection rules are retrieved from Rulezet.