CVE-2026-70589: CWE-20: Improper Input Validation in TryGhost Ghost
Ghost, a Node.js content management system, contains an improper input validation vulnerability in versions from 4.22.0 up to but not including 6.54.1. This flaw allowed users to redeem subscription offers that were no longer active. The issue is resolved in version 6.54.1.
AI Analysis
Technical Summary
CVE-2026-70589 is an improper input validation vulnerability (CWE-20) in the Ghost CMS. From version 4.22.0 until 6.54.1, Ghost failed to properly validate subscription offer states, allowing users to redeem offers that should have been inactive. This could lead to unauthorized subscription benefits. The vulnerability is fixed in version 6.54.1.
Potential Impact
The vulnerability allows unauthorized redemption of expired or inactive subscription offers, potentially leading to unauthorized access to subscription benefits. The CVSS score of 4.8 (medium severity) reflects limited impact on confidentiality and integrity, with no availability impact.
Mitigation Recommendations
Upgrade Ghost to version 6.54.1 or later, where the improper input validation issue has been fixed. Patch status is confirmed by the vendor stating the fix is included in 6.54.1.
CVE-2026-70589: CWE-20: Improper Input Validation in TryGhost Ghost
Description
Ghost, a Node.js content management system, contains an improper input validation vulnerability in versions from 4.22.0 up to but not including 6.54.1. This flaw allowed users to redeem subscription offers that were no longer active. The issue is resolved in version 6.54.1.
CVSS v3.1
Score 4.8medium
Affected software
TryGhost
Ghost
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-70589 is an improper input validation vulnerability (CWE-20) in the Ghost CMS. From version 4.22.0 until 6.54.1, Ghost failed to properly validate subscription offer states, allowing users to redeem offers that should have been inactive. This could lead to unauthorized subscription benefits. The vulnerability is fixed in version 6.54.1.
Potential Impact
The vulnerability allows unauthorized redemption of expired or inactive subscription offers, potentially leading to unauthorized access to subscription benefits. The CVSS score of 4.8 (medium severity) reflects limited impact on confidentiality and integrity, with no availability impact.
Mitigation Recommendations
Upgrade Ghost to version 6.54.1 or later, where the improper input validation issue has been fixed. Patch status is confirmed by the vendor stating the fix is included in 6.54.1.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-08-04T19:50:27.327Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a725cbabf8831d5398274ef
Added to database: 08/04/2026, 21:42:18 UTC
Last enriched: 08/12/2026, 15:51:05 UTC
Last updated: 09/18/2026, 22:01:37 UTC
Views: 82
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