Authorization bypass through user-controlled key in Ghost - CVE-2026-59817
Published: July 30, 2026
Vulnerability identifier: #VU140543
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-59817
CWE-ID: CWE-639
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to obtain paid gift memberships for a minimal payment.
The vulnerability exists due to authorization bypass through a user-controlled key in Ghost's public donation checkout flow when processing donation checkout requests. A remote attacker can submit a crafted checkout request to obtain paid gift memberships for a minimal payment.
No customer or member data is exposed, and the issue cannot be used to steal money from a site or its members.
Affected software
Ghost
How to mitigate CVE-2026-59817
Install security update from vendor's website.
Ghost - update to 6.44.0