CVE-2026-16039 MStore API < 4.21.0 - Subscriber+ Order and Customer PII Disclosure via IDOR
Authenticated users can access all WooCommerce orders and customer PII due to missing authorization checks on the vendor-orders endpoint.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-16039?
CVE-2026-16039 is a medium-severity missing authorization vulnerability in Unknown MStore API, published on 7 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The MStore API WordPress plugin before 4.21.0 does not restrict its vendor-orders endpoint to the caller's own orders, allowing any authenticated user, including Subscribers, to read every WooCommerce order in the store together with each customer's personal information.
Weakness: CWE-639
Which versions are affected by CVE-2026-16039?
How do I fix CVE-2026-16039?
No fix has been published for CVE-2026-16039 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-2026-16039 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-16039 exists.
Sources
Also known as GHSA-wgmj-93jg-87w3.