# CVE-2026-70589: Ghost improper validation of archived subscription offers

Source: https://junglewise.ai/threats/cve-2026-70589-ghost-improper-validation-of-archived-subscription-offers  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-04. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-70589 · Severity: medium · CVSS 4.8 · Published 2026-08-04

Ghost is an open-source platform used for publishing, memberships, subscriptions, and newsletters. A missing validation check allows users to redeem subscription offers that have been archived or otherwise deactivated, potentially allowing attackers to bypass intended commercial restrictions and gain access to services or discounts they should not be eligible for.

Technologies: [ghost (npm)](https://junglewise.ai/threats/technologies/ghost). Vendors: [npm](https://junglewise.ai/threats/vendors/npm).

## Quick answers

**Is CVE-2026-70589 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-70589 being exploited in the wild.

**How severe is CVE-2026-70589?** Medium severity, with a CVSS score of 4.8, published 4 August 2026.

**Which products and versions are affected?** ghost (npm) >= 4.22.0, < 6.54.1, SEMVER:introduced=4.22.0,fixed=6.54.1.

**Is there a fix for CVE-2026-70589?** Yes. ghost (npm): upgrade to 6.54.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-70589 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-70589?** Check whether you run ghost (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- ghost (npm): upgrade to 6.54.1 or later

  ```sh
  npm install ghost@6.54.1
  ```


## Technical details

The vulnerability is a missing validation check in Ghost's offer redemption logic (CWE-20: Improper Input Validation). When processing subscription offer redemptions, the application fails to verify that an offer is still active before accepting the redemption. This allows an attacker with network access to redeem archived or inactive offers without authentication or user interaction required. An attacker can exploit this to gain unauthorized discounts, extended trial periods, or premium access by redeeming offers that should no longer be valid. The fix was implemented in version 6.54.1 by adding proper validation to reject inactive offers during the redemption process.

## Affected products

- Ghost Ghost 4.22.0 to 6.54.0

## Identifiers

- CVE-2026-70589
- GHSA-4wx2-7gvj-qfq3

## Timeline

- 2026-07-30: disclosed
- 2026-08-04: advisory
- 2026-08-04: patched: Version 6.54.1 released with fix

## References

- [https://github.com/TryGhost/Ghost/security/advisories/GHSA-4wx2-7gvj-qfq3](https://github.com/TryGhost/Ghost/security/advisories/GHSA-4wx2-7gvj-qfq3)
- [https://github.com/TryGhost/Ghost/commit/d91c0fc52dfc987d71a9803dbcbe6447d21b92fb](https://github.com/TryGhost/Ghost/commit/d91c0fc52dfc987d71a9803dbcbe6447d21b92fb)
- [https://github.com/TryGhost/Ghost](https://github.com/TryGhost/Ghost)

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- [Ghost: Server-Side Request Forgery in Webhook Trigger](https://junglewise.ai/threats/cve-2026-105682-ghost-is-a-node-js-content-management-system-from-1-18-0-until-6)
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