CVE-2026-18233 MStore API < 4.21.1 - Subscriber+ Arbitrary Order Completion
Authenticated users can mark arbitrary orders as completed without payment due to missing ownership verification in the MStore API plugin.
- 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-2026-18233?
CVE-2026-18233 is a medium-severity missing authorization vulnerability in Unknown MStore API, published on 29 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 4.21.1 does not verify that the order targeted by one of its delivery endpoints belongs to the requester, allowing any authenticated user, including Subscribers, to mark arbitrary orders as completed and paid without any payment being made.
Weakness: CWE-862
Which versions are affected by CVE-2026-18233?
How do I fix CVE-2026-18233?
No fix has been published for CVE-2026-18233 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-2026-18233 being exploited?
There is no known exploitation of CVE-2026-18233 in the wild and no public exploit code.
Sources
Also known as GHSA-76wx-7j8r-7mr2.