The Download Monitor plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 5.1.7 via the executePayment() function due to missing validation on a user controlled key. This makes it possible for unauthenticated attackers to complete arbitrary pending orders by exploiting a mismatch between the PayPal transaction token and the local order, allowing theft of paid digital goods by paying a minimal amount for a low-cost item and using that payment token to finalize a high-value order.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Download Monitor Plugin | — | Update download-monitor plugin to version 5.1.8, or a newer patched version | Apr 29, 2026 | Mar 29, 2026 |
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