CVE-2026-105649: Ghost Cross-Site Scripting Vulnerability

HIGH
Advisory Identifier: GHSA-8575-cr6v-7jh4
Share
CVSS 7.3
CWE-434 CWE-79
Published
Advisory Summary

CVE-2026-105649 is a HIGH (CVSS 7.3) cross-site scripting vulnerability (CWE-434: Unrestricted Upload of File with Dangerous Type) affecting Ghost libraries in the npm ecosystem. The issue involves stored xss via svg uploads bypassing sanitization. Remediation is available by upgrading affected packages to version 6.65.0.

CVE-2026-105649 at a Glance

CVE Identifier CVE-2026-105649
GHSA Identifier GHSA-8575-cr6v-7jh4
Severity HIGH
CVSS v3.1 Base Score 7.3
CWE Classification CWE-434: Unrestricted Upload of File with Dangerous Type
Affected Product Ghost
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 7.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction Required (UI:R)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2026-105649

To remediate this vulnerability, upgrade all affected Ghost dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

ghost fixed: 6.65.0 
npm install ghost@6.65.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls ghost

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-105649, inspect your project dependencies using npm:

npm ls ghost

Analyze the terminal output to locate any version of Ghost in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 6.65.0), your application is affected.

Note: The npm ls ghost command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-434: Unrestricted Upload of File with Dangerous Type, where the product allows the upload or transfer of dangerous file types that are automatically processed within its environment. In Ghost, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact SVG media thumbnails, and SVG images uploaded with a non-SVG file extension, were stored without sanitization. This allowed any staff user, including Contributors, to host scripts on the site's domain, possibly resulting in compromise of other staff users' admin sessions. ### Vulnerable versions This vulnerability is present in Ghost from v4.22.0 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](https://hub.docker.com/_/ghost). Updating a Docker-based Ghost instance [is documented here](https://docs.ghost.org/install/docker#updating-ghost). If your Ghost is a Ghost-CLI install see our documentation on [updating it to the latest version here](https://docs.ghost.org/update). ### References Ghost thanks [Ibrahim AlJaafreh](https://cystack.ps) of Cystack Red Team, [Anand Prajapati](https://www.linkedin.com/in/anand-prajapati-7a265a369/), [白墨](https://github.com/5255fgh), and [Nhat Anh Vu](https://github.com/nhattanhh) for disclosing this vulnerability responsibly. ### For more information If you have any questions or comments about this advisory, email us at [security@ghost.org](mailto:security@ghost.org).

CVE-2026-105649 Affected Ghost Versions

1 component(s)
Fixed Versions:
6.65.0
Product / Package Ecosystem Affected Versions Fixed Version
ghost
npm/ghost
npm
≥ 4.22.0
< 6.65.0
6.65.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/TryGhost/Ghost/security/advisories/GHSA-8575-cr6v-7jh4
NVD — CVE-2026-105649 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-105649
Ghost Source Repository REPOSITORY
https://github.com/TryGhost/Ghost/issues/30919
Security Fix Commit FIX COMMIT
https://github.com/TryGhost/Ghost/commit/80686226d23df56749f6b7ebb484850a8eba8072
Ghost Source Repository REPOSITORY
https://github.com/TryGhost/Ghost
Ghost Release RELEASE
https://github.com/TryGhost/Ghost/releases/tag/v6.65.0

Frequently Asked Questions

What is CVE-2026-105649?
CVE-2026-105649 is a security vulnerability in Ghost involving Stored XSS via SVG Uploads Bypassing Sanitization under CWE-434: Unrestricted Upload of File with Dangerous Type.
Which Ghost versions are affected?
Affected versions include releases prior to 6.65.0 across affected packages: ghost.
What version fixes CVE-2026-105649?
Upgrading to 6.65.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is ghost affected?
Yes, ghost is affected in releases prior to 6.65.0. Upgrade your dependency to 6.65.0 or later.
What is the CVSS score of CVE-2026-105649?
CVE-2026-105649 has a CVSS v3.1 base score of 7.3 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N.
What CWE is associated with CVE-2026-105649?
CVE-2026-105649 is classified under CWE-434: Unrestricted Upload of File with Dangerous Type (The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.).
How can I check npm dependencies for CVE-2026-105649?
Run the dependency tree command: 'npm ls ghost'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-8575-cr6v-7jh4",
  "modified" : "2026-10-07T20:35:22Z",
  "published" : "2026-10-07T20:35:22Z",
  "aliases" : [ "CVE-2026-105649" ],
  "summary" : "Ghost: Stored XSS via SVG Uploads Bypassing Sanitization",
  "details" : "### Impact\n\nSVG media thumbnails, and SVG images uploaded with a non-SVG file extension, were stored without sanitization. This allowed any staff user, including Contributors, to host scripts on the site's domain, possibly resulting in compromise of other staff users' admin sessions.\n\n### Vulnerable versions\n\nThis vulnerability is present in Ghost from v4.22.0 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 [Ibrahim AlJaafreh](https://cystack.ps) of Cystack Red Team, [Anand Prajapati](https://www.linkedin.com/in/anand-prajapati-7a265a369/), [白墨](https://github.com/5255fgh), and [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).",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "ghost"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "4.22.0"
      }, {
        "fixed" : "6.65.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/TryGhost/Ghost/security/advisories/GHSA-8575-cr6v-7jh4"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-105649"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/TryGhost/Ghost/issues/30919"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/TryGhost/Ghost/commit/80686226d23df56749f6b7ebb484850a8eba8072"
  }, {
    "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-434", "CWE-79" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-10-07T20:35:22Z",
    "nvd_published_at" : "2026-10-05T20:17:13Z"
  }
}