CVE-2026-89289 Fast Courier <= 5.2.3 - Unauthenticated Order Fulfillment Update via order-status-update REST Endpoint
Unauthenticated attackers can modify WooCommerce order fulfillment status and tracking details via an unprotected REST endpoint in the Fast Courier plugin.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-89289?
CVE-2026-89289 is a medium-severity missing authorization vulnerability in Unknown Fast Courier, published on 6 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-862
Which versions are affected by CVE-2026-89289?
How do I fix CVE-2026-89289?
No fix has been published for CVE-2026-89289 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-89289 being exploited?
There is no known exploitation of CVE-2026-89289 in the wild and no public exploit code.
Sources
Also known as GHSA-r2m9-vxc3-w8ph.