Medium severity · published Aug 7, 2026
CVE-2026-16039
MStore API < 4.21.0 - Subscriber+ Order and Customer PII Disclosure via IDOR
6.5
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 27% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MA
MStore API ·
before 4.21.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-16039
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-16039
wpscan.com
https://wpscan.com/vulnerability/85c6ff37-4761-420c-970f-05b2c50d3b28/
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