CVE-2026-89289

3th percentile - higher than 3% of all known CVEs

The Fast Courier WordPress plugin through 5.2.3 does not restrict an unauthenticated REST route that writes order fulfillment data, allowing unauthenticated attackers to overwrite the courier status and customer-facing tracking details of any WooCommerce order by supplying its id.

The risk is the ability to manipulate order fulfillment information, which may lead to loss of customer trust and compromise of delivery process integrity.

It is recommended to update the Fast Courier plugin to a patched version and restrict access to REST routes to authenticated users with appropriate permissions.