CVE-2026-16962: Unknown Tamara Checkout

Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days.

The Tamara Checkout WordPress plugin through 1.9.9.20 does not verify the order key, a nonce, or any capability on its public payment cancel/fail return URLs, changing a WooCommerce order's status based solely on an attacker-supplied numeric order id, so an unauthenticated attacker can cancel or fail arbitrary orders store-wide by enumerating ids (triggering downstream stock-release and notification side-effects).

Affected products

• Unknown Tamara Checkout: up to and including 1.9.9.20

Published 2026-08-21. Last modified 2026-08-26.