CVE-2026-103273: Ghost 4.3.0 before 6.58.0 Incorrect Authorization via Staff Token

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-01 · updated 2026-10-01
Weakness: CWE-863

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.

Affected products

TryGhost Ghost: from 4.3.0 before 6.58.0 — fixed in 6.58.0

How to fix

Upgrade to a fixed version: TryGhost Ghost 6.58.0. Check the vendor advisory for mitigations.

References

https://github.com/TryGhost/Ghost/security/advisories/GHSA-jj85-wvj2-r86m
https://www.vulncheck.com/advisories/ghost-4.3.0-before-6.58.0-incorrect-authorization-via-staff-token

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