CVE-2026-18234 MStore API < 4.21.1 - Subscriber+ Arbitrary Order Payment Bypass via Wallet
Authenticated users can mark arbitrary orders as paid without payment, bypassing wallet balance checks 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-2026-18234?
CVE-2026-18234 is a medium-severity 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 its wallet payment handling belongs to the requester, and does not deduct the wallet balance for most payment methods, allowing any authenticated user, including Subscribers, to mark arbitrary orders as paid without any payment being taken.
Weakness: CWE-862
Which versions are affected by CVE-2026-18234?
How do I fix CVE-2026-18234?
No fix has been published for CVE-2026-18234 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-18234 being exploited?
There is no known exploitation of CVE-2026-18234 in the wild and no public exploit code.
Sources
Also known as GHSA-jmq8-gg6r-m32f.