CVE-2026-105643: Ghost Cross-Site Scripting Vulnerability

HIGH
Advisory Identifier: GHSA-69qc-f5m6-889c
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CVSS 7.3
CWE-79 CWE-653
Published
Advisory Summary

CVE-2026-105643 is a HIGH (CVSS 7.3) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Ghost libraries in the npm ecosystem. The issue involves stored xss via embed card previews. Remediation is available by upgrading affected packages to version 6.67.0.

CVE-2026-105643 at a Glance

CVE Identifier CVE-2026-105643
GHSA Identifier GHSA-69qc-f5m6-889c
Severity HIGH
CVSS v3.1 Base Score 7.3
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
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-2026-105643

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: 6.67.0 
npm install ghost@6.67.0
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-2026-105643, 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 6.67.0), 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-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. 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 Embed cards in the Ghost editor could be used to bypass the fix for GHSA-8vhf-xxpj-4qrg. Any staff user, including Contributors, could store scripts in post content that ran when another staff user opened the post in the editor, possibly resulting in compromise of that user's admin session. Self-hosted sites should leave the new `security.embedPreviewUrl` config option at its default. ### Vulnerable versions This vulnerability is present in Ghost from v6.34.0 up to v6.65.0. ### Patches v6.67.0 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 [DONG2209 (Dong Nguyen)](https://github.com/DONG2209) and Pedro Pinho 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-2026-105643 Affected Ghost Versions

1 component(s)
Fixed Versions:
6.67.0
Product / Package Ecosystem Affected Versions Fixed Version
ghost
npm/ghost
npm
≥ 6.34.0
< 6.67.0
6.67.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/TryGhost/Ghost/security/advisories/GHSA-69qc-f5m6-889c
GitHub Advisory / Wiki ADVISORY
https://github.com/penpot/penpot/security/advisories/GHSA-qvq5-c536-pmx8
NVD — CVE-2026-105643 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-105643
Ghost Source Repository REPOSITORY
https://github.com/TryGhost/Ghost

Frequently Asked Questions

What is CVE-2026-105643?
CVE-2026-105643 is a security vulnerability in Ghost involving Stored XSS via Embed Card Previews under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Ghost versions are affected?
Affected versions include releases prior to 6.67.0 across affected packages: ghost.
What version fixes CVE-2026-105643?
Upgrading to 6.67.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is ghost affected?
Yes, ghost is affected in releases prior to 6.67.0. Upgrade your dependency to 6.67.0 or later.
What is the CVSS score of CVE-2026-105643?
CVE-2026-105643 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-2026-105643?
CVE-2026-105643 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).
How can I check npm dependencies for CVE-2026-105643?
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-69qc-f5m6-889c",
  "modified" : "2026-10-07T20:43:05Z",
  "published" : "2026-10-07T20:43:05Z",
  "aliases" : [ "CVE-2026-105643" ],
  "summary" : "Ghost: Stored XSS via Embed Card Previews",
  "details" : "### Impact\n\nEmbed cards in the Ghost editor could be used to bypass the fix for GHSA-8vhf-xxpj-4qrg. Any staff user, including Contributors, could store scripts in post content that ran when another staff user opened the post in the editor, possibly resulting in compromise of that user's admin session.\n\nSelf-hosted sites should leave the new `security.embedPreviewUrl` config option at its default. \n\n### Vulnerable versions\n\nThis vulnerability is present in Ghost from v6.34.0 up to v6.65.0.\n\n### Patches\n\nv6.67.0 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 [DONG2209 (Dong Nguyen)](https://github.com/DONG2209) and Pedro Pinho 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" : "6.34.0"
      }, {
        "fixed" : "6.67.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/TryGhost/Ghost/security/advisories/GHSA-69qc-f5m6-889c"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/penpot/penpot/security/advisories/GHSA-qvq5-c536-pmx8"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-105643"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/TryGhost/Ghost"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-653", "CWE-79" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-10-07T20:43:05Z",
    "nvd_published_at" : "2026-10-05T19:17:18Z"
  }
}