Ghostfolio up to 3.3.x Stripe Checkout Success URL callback checkoutSessionId privileges management

Summaryinfo

A vulnerability was found in Ghostfolio up to 3.3.x. It has been declared as problematic. Affected by this vulnerability is an unknown functionality of the file /api/v1/subscription/stripe/callback of the component Stripe Checkout Success URL Handler. Such manipulation of the argument checkoutSessionId leads to privileges management. This vulnerability is traded as CVE-2026-47127. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Ghostfolio up to 3.3.x. It has been rated as problematic. Affected by this issue is some unknown processing of the file /api/v1/subscription/stripe/callback of the component Stripe Checkout Success URL Handler. The manipulation of the argument checkoutSessionId with an unknown input leads to a privileges management vulnerability. Using CWE to declare the problem leads to CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. Impacted is integrity. CVE summarizes:

Ghostfolio is an open source wealth management software. Prior to version 3.4.0, Ghostfolio's Stripe checkout success-URL handler at `GET /api/v1/subscription/stripe/callback?checkoutSessionId=<id>` retrieves the Stripe Checkout Session by ID and unconditionally grants a Premium subscription to the session's `client_reference_id` — without ever checking `session.payment_status` or `session.status`. There is no separate Stripe webhook endpoint with `stripe-signature` verification; this callback is the sole code path that creates Stripe-driven subscriptions. Any authenticated user can self-grant a 1-year Premium subscription without ever paying. Version 3.4.0 rejects sessions unless `session.payment_status === 'paid'` AND `session.status === 'complete'` (fails closed). Additionally, new unique `stripeCheckoutSessionId` column → a session can't be redeemed twice (race-safe via DB unique constraint).

The advisory is available at github.com. This vulnerability is handled as CVE-2026-47127 since 05/18/2026. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

Upgrading to version 3.4.0 eliminates this vulnerability.

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Productinfo

Name

• Ghostfolio

Version

• 3.0
• 3.1
• 3.2
• 3.3

Website

• Product: https://github.com/ghostfolio/ghostfolio/

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