Ghost: Blind Password Hash Disclosure in Ghost Admin API

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

4.8 · CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:H/A:N

EPSS

• CVE-2026-70590: 0.32% estimated exploitation activity in the next 30 days; percentile 25.42 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

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 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. Updating a Docker-based Ghost instance is documented here. If your Ghost is a Ghost-CLI install see our documentation on updating it to the latest version here. Workarounds If upgrading immediately is not possible, ensure all staff users have Multi-factor Authentication (MFA) enabled. This will help prevent an attacker from…

Published by the source

4 Aug 2026, 21:28 UTC

Last modified by the source

4 Aug 2026, 21:28 UTC

Source last checked

26 Oct 2026, 13:00 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-jm22-3w23-5q7w

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# Patch Next advisory brief: CVE-2026-70590

Advisory: Ghost: Blind Password Hash Disclosure in Ghost Admin API
IDs: CVE-2026-70590, GHSA-jm22-3w23-5q7w
Record: https://patchnext.com/advisories/cve-2026-70590 (revision 1, source checked 26 Oct 2026, 13:00 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 4.8)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: ghost 6.54.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm ghost: affected < 6.54.1; fixed in 6.54.1

## Suggested inspection (read-only)
- `npm ls ghost --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on ghost.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-jm22-3w23-5q7w (GitHub-reviewed advisory GHSA-jm22-3w23-5q7w lists affected ranges: npm ghost >=0 <6.54.1)

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