What’s Vulnerable › Vulnerabilities
CVE-2026-104641: Simple Shopping Cart < 5.3.3 - Unauthenticated Payment Bypass via Unverified PayPal IPN Recipient
- Severity: medium (CVSS 5.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.1% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-10-21 · updated 2026-10-21
- Weakness: CWE-345
Description
The Simple Shopping Cart WordPress plugin before 5.3.3 does not verify that a PayPal payment notification is for a payment received by the site owner's PayPal account in its default configuration, allowing unauthenticated attackers to have their orders marked as paid using a payment made to an account they control.
Affected products
- Simple Shopping Cart: before 5.3.3 — fixed in 5.3.3
How to fix
Upgrade to a fixed version: Simple Shopping Cart 5.3.3. Check the vendor advisory for mitigations.
References
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