CVE-2026-18603: Unknown Piweb Cancel Order / Refund Request For Woocommerce

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

The PiWeb Cancel order / Refund request for WooCommerce WordPress plugin before 1.3.4.34 does not have authorization or ownership checks when adding the contents of a previous order to the cart, allowing unauthenticated users to disclose the contents of other customers' orders, as well as to clear and repopulate a logged in user's cart via a crafted link.

Affected products

• Unknown Piweb Cancel Order / Refund Request For Woocommerce: before 1.3.4.34 (fixed in 1.3.4.34)

Published 2026-08-09. Last modified 2026-08-26.