CVE-2026-16038: MStore API (WordPress plugin) · Missing Authorization
Affects MStore API (WordPress plugin)Source CVE Database V5
Not known to be exploited · CVSS 9.1 Critical : upgrade to 4.21.0 as a priority.
Data as of 5 Nov 2026, 00:01 UTC
- EPSS
- 0.4% chance of exploitation in 30 days – higher than 36% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 4.21.0
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NExploitation evidence
Disclosed: evidence found.
CVE published 7 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.
What to do
Upgrade MStore API (WordPress plugin) to 4.21.0.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| MStore API | Affected
| Fixed in
|
AI-suggested
If you cannot patch yet, restrict access to payment-completion endpoints and monitor for suspicious activity related to order status changes.
Description
The MStore API WordPress plugin before version 4.21.0 contains a missing authorization vulnerability in its payment-completion endpoints. This flaw allows unauthenticated attackers to mark arbitrary orders as paid without verifying payment with the payment gateway, potentially enabling free acquisition of goods or services.