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CVE-2026-47127
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).
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The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the integrity of the data.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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