CVE-2026-103273
Received Received - Intake

Authentication Bypass in Ghost CMS via Staff Tokens

Publication date: 2026-10-01

Last updated on: 2026-10-01

Assigner: VulnCheck

Description
Ghost versions 4.3.0 before 6.58.0 contain an authentication bypass vulnerability where lower-privilege staff users can use staff tokens to bypass post editing restrictions. Attackers with staff credentials can leverage tokens to edit posts beyond their assigned privilege level.

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Meta Information

Published
2026-10-01
Last Modified
2026-10-01
Generated
2026-10-01
AI Q&A
2026-10-01
EPSS Evaluated
N/A
NVD
CVE-2026-103273
EUVD
EUVD-2026-90666

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
ghost ghost to 6.58.0 (exc)
tryghost ghost to 6.58.0 (exc)
tryghost ghost to 6.58.0 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-863 The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

Attack-Flow Graph

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Executive Summary

Ghost versions 4.3.0 before 6.58.0 have an authentication bypass flaw where lower-privilege staff users can use staff tokens to edit posts beyond their assigned permissions. This incorrect authorization vulnerability allows attackers with staff credentials to bypass restrictions and modify posts they shouldn't access.

Detection Guidance

To detect this vulnerability, check Ghost installation versions. Run commands like 'ghost version' or inspect Docker containers for Ghost versions between 4.3.0 and 6.57.0. Review staff token usage logs for unauthorized post edits.

Impact Analysis

If you run a Ghost site with versions 4.3.0 to 6.57.0, unauthorized staff members could edit posts they don't have permission to change. This could lead to misinformation, content tampering, or reputational damage if sensitive posts are altered without approval.

Compliance Impact

This vulnerability could impact compliance by allowing unauthorized changes to sensitive content, potentially violating integrity requirements in GDPR or HIPAA. If posts containing regulated data are edited without proper authorization, it may lead to non-compliance with data integrity and access control provisions.

Mitigation Strategies

Immediately update Ghost to version 6.58.0 or later. For Docker installations, pull the latest image and restart containers. For Ghost-CLI, run 'ghost update'. Remove any unauthorized staff tokens and audit user permissions.

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