CVE-2026-70594: Ghost Session Fixation Vulnerability

MODERATE
Advisory Identifier: GHSA-7mpp-r37j-x5wh
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CVSS 6.7
CWE-384
Published
Advisory Summary

CVE-2026-70594 is a MODERATE (CVSS 6.7) session fixation vulnerability (CWE-384: Session Fixation) affecting Ghost libraries in the npm ecosystem. The issue involves session fixation in ghost admin. Remediation is available by upgrading affected packages to version 6.54.1.

CVE-2026-70594 at a Glance

CVE Identifier CVE-2026-70594
GHSA Identifier GHSA-7mpp-r37j-x5wh
Severity MODERATE
CVSS v3.1 Base Score 6.7
CWE Classification CWE-384: Session Fixation
Affected Product Ghost
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 6.7

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

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

How to Fix CVE-2026-70594

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-2026-70594, 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-384: Session Fixation, where authenticating a user, or otherwise establishing a new user session, without invalidating any existing session identifier gives an attacker the opportunity to steal authenticated sessions. 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 Ghost Admin did not invalidate existing sessions on login which could have allowed for session fixation attacks. Successful exploitation would have required another vulnerability on the same domain where Ghost Admin was hosted. ### Vulnerable versions This vulnerability is present in Ghost from v2.2.0 to v6.54.0. ### 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). ### References Ghost thanks meifukun for disclosing this vulnerability responsibly. ### For more information If you have any questions or comments about this advisory, email Ghost at [security@ghost.org](mailto:security@ghost.org).

CVE-2026-70594 Affected Ghost Versions

1 component(s)
Fixed Versions:
6.54.1
Product / Package Ecosystem Affected Versions Fixed Version
ghost
npm/ghost
npm
≥ 2.2.0
< 6.54.1
6.54.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/TryGhost/Ghost/security/advisories/GHSA-7mpp-r37j-x5wh
Ghost Source Repository REPOSITORY
https://github.com/TryGhost/Ghost/pull/29634
Security Fix Commit FIX COMMIT
https://github.com/TryGhost/Ghost/commit/6b1c85c30dd0bacb4d5ffe64fc675ac9342d800c
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-2026-70594?
CVE-2026-70594 is a security vulnerability in Ghost involving Session Fixation in Ghost Admin under CWE-384: Session Fixation.
Which Ghost versions are affected?
Affected versions include releases prior to 6.54.1 across affected packages: ghost.
What version fixes CVE-2026-70594?
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-2026-70594?
CVE-2026-70594 has a CVSS v3.1 base score of 6.7 (MODERATE) with vector string CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:L.
What CWE is associated with CVE-2026-70594?
CVE-2026-70594 is classified under CWE-384: Session Fixation (Authenticating a user, or otherwise establishing a new user session, without invalidating any existing session identifier gives an attacker the opportunity to steal authenticated sessions.).
How can I check npm dependencies for CVE-2026-70594?
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-7mpp-r37j-x5wh",
  "modified" : "2026-08-04T21:53:53Z",
  "published" : "2026-08-04T21:53:53Z",
  "aliases" : [ "CVE-2026-70594" ],
  "summary" : "Ghost: Session Fixation in Ghost Admin",
  "details" : "### Impact\n\nGhost Admin did not invalidate existing sessions on login which could have allowed for session fixation attacks. Successful exploitation would have required another vulnerability on the same domain where Ghost Admin was hosted.\n\n### Vulnerable versions\n\nThis vulnerability is present in Ghost from v2.2.0 to v6.54.0.\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### References\n\nGhost thanks meifukun 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).",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "ghost"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.2.0"
      }, {
        "fixed" : "6.54.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/TryGhost/Ghost/security/advisories/GHSA-7mpp-r37j-x5wh"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/TryGhost/Ghost/pull/29634"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/TryGhost/Ghost/commit/6b1c85c30dd0bacb4d5ffe64fc675ac9342d800c"
  }, {
    "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-384" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-08-04T21:53:53Z",
    "nvd_published_at" : null
  }
}