TryGhost up to 6.43.x Checkout Flow improper authentication

Summaryinfo

A vulnerability marked as problematic has been reported in TryGhost Ghost up to 6.43.x. This affects an unknown part of the component Checkout Flow. This manipulation causes improper authentication. The identification of this vulnerability is CVE-2026-59817. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in TryGhost Ghost up to 6.43.x. It has been declared as problematic. Affected by this vulnerability is an unknown code of the component Checkout Flow. The manipulation with an unknown input leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect integrity. The summary by CVE is:

Ghost is a Node.js content management system. From 6.27.0 before 6.44.0, Ghost's public donation checkout flow allowed an unauthenticated attacker to control donation checkout metadata and obtain full paid gift memberships for a minimal payment without exposing customer or member data or stealing money from a site or its members. This issue is fixed in version 6.44.0.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-59817 since 07/07/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available.

Upgrading to version 6.44.0 eliminates this vulnerability.

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Productinfo

Vendor

• TryGhost

Name

• Ghost

Version

• 6.0
• 6.1
• 6.2
• 6.3
• 6.4
• 6.5
• 6.6
• 6.7
• 6.8
• 6.9
• 6.10
• 6.11
• 6.12
• 6.13
• 6.14
• 6.15
• 6.16
• 6.17
• 6.18
• 6.19
• 6.20
• 6.21
• 6.22
• 6.23
• 6.24
• 6.25
• 6.26
• 6.27
• 6.28
• 6.29
• 6.30
• 6.31
• 6.32
• 6.33
• 6.34
• 6.35
• 6.36
• 6.37
• 6.38
• 6.39
• 6.40
• 6.41
• 6.42
• 6.43

Website

• Product: https://github.com/TryGhost/Ghost/

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