CVE-2026-70590: Ghost Blind Password Hash Disclosure Vulnerability

MODERATE
Advisory Identifier: GHSA-jm22-3w23-5q7w
Share
CVSS 4.8
CWE-200
Published
Advisory Summary

CVE-2026-70590 is a MODERATE (CVSS 4.8) blind password hash disclosure vulnerability (CWE-200: Exposure of Sensitive Information to an Unauthorized Actor) affecting Ghost libraries in the npm ecosystem. The issue involves blind password hash disclosure in ghost admin api. Remediation is available by upgrading affected packages to version 6.54.1.

CVE-2026-70590 at a Glance

CVE Identifier CVE-2026-70590
GHSA Identifier GHSA-jm22-3w23-5q7w
Severity MODERATE
CVSS v3.1 Base Score 4.8
CWE Classification CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
Affected Product Ghost
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 4.8

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

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

How to Fix CVE-2026-70590

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: 6.54.1 
npm install ghost@6.54.1
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-2026-70590, 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 6.54.1), 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-200: Exposure of Sensitive Information to an Unauthorized Actor, where the product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. 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 Any staff-level user was able to leak the hashed passwords of other staff users. An offline password-guessing attack against the hashes could lead to account takeover if successful, but [Device Verification](https://docs.ghost.org/security#device-verification) should have prevented an attacker from logging in with a recovered password. Depending on the database used, leaked hashes may not have had the correct casing for all characters, increasing the difficulty of a password-guessing attack. ### Vulnerable versions This vulnerability is present in Ghost versions v6.54.0 and earlier. ### Patches v6.54.1 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). ### Workarounds If upgrading immediately is not possible, ensure all staff users have [Multi-factor Authentication](https://docs.ghost.org/security#email-2fa) (MFA) enabled. This will help prevent an attacker from logging in with any passwords that are successfully recovered from the leaked hashes. ### References Ghost thanks Chapman Schleiss 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-2026-70590 Affected Ghost Versions

1 component(s)
Fixed Versions:
6.54.1
Product / Package Ecosystem Affected Versions Fixed Version
ghost
npm/ghost
npm
< 6.54.1
6.54.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/TryGhost/Ghost/security/advisories/GHSA-jm22-3w23-5q7w
Ghost Source Repository REPOSITORY
https://github.com/TryGhost/Ghost/pull/29628
Security Fix Commit FIX COMMIT
https://github.com/TryGhost/Ghost/commit/63c31fad7e473caa62d8fbb4651a04a2a62b5d00
Ghost Source Repository REPOSITORY
https://github.com/TryGhost/Ghost
Ghost Release RELEASE
https://github.com/TryGhost/Ghost/releases/tag/v6.54.1

Frequently Asked Questions

What is CVE-2026-70590?
CVE-2026-70590 is a security vulnerability in Ghost involving Blind Password Hash Disclosure in Ghost Admin API under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor.
Which Ghost versions are affected?
Affected versions include releases prior to 6.54.1 across affected packages: ghost.
What version fixes CVE-2026-70590?
Upgrading to 6.54.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is ghost affected?
Yes, ghost is affected in releases prior to 6.54.1. Upgrade your dependency to 6.54.1 or later.
What is the CVSS score of CVE-2026-70590?
CVE-2026-70590 has a CVSS v3.1 base score of 4.8 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:H/A:N.
What CWE is associated with CVE-2026-70590?
CVE-2026-70590 is classified under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor (The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.).
How can I check npm dependencies for CVE-2026-70590?
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-jm22-3w23-5q7w",
  "modified" : "2026-08-04T21:28:35Z",
  "published" : "2026-08-04T21:28:35Z",
  "aliases" : [ "CVE-2026-70590" ],
  "summary" : "Ghost: Blind Password Hash Disclosure in Ghost Admin API",
  "details" : "### Impact\n\nAny staff-level user was able to leak the hashed passwords of other staff users. An offline password-guessing attack against the hashes could lead to account takeover if successful, but [Device Verification](https://docs.ghost.org/security#device-verification) should have prevented an attacker from logging in with a recovered password. Depending on the database used, leaked hashes may not have had the correct casing for all characters, increasing the difficulty of a password-guessing attack.\n\n### Vulnerable versions\n\nThis vulnerability is present in Ghost versions v6.54.0 and earlier.\n\n### Patches\n\nv6.54.1 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### Workarounds\n\nIf upgrading immediately is not possible, ensure all staff users have [Multi-factor Authentication](https://docs.ghost.org/security#email-2fa) (MFA) enabled. This will help prevent an attacker from logging in with any passwords that are successfully recovered from the leaked hashes.\n\n### References\n\nGhost thanks Chapman Schleiss 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:H/PR:H/UI:R/S:U/C:L/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "ghost"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "6.54.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/TryGhost/Ghost/security/advisories/GHSA-jm22-3w23-5q7w"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/TryGhost/Ghost/pull/29628"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/TryGhost/Ghost/commit/63c31fad7e473caa62d8fbb4651a04a2a62b5d00"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/TryGhost/Ghost"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/TryGhost/Ghost/releases/tag/v6.54.1"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-08-04T21:28:35Z",
    "nvd_published_at" : null
  }
}