6.5

CVE-2026-18233: unknown mstore api Missing Authorization

CVSS: 6.5v3.1MediumDeferred
Published 29-08-2026Last modified 30-08-2026
Open JSON

Vulnerability summary

CVE-2026-18233 is a medium (CVSS 6.5) Missing Authorization vulnerability in unknown mstore api. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 5.8% of scored vulnerabilities. 1 public exploit is recorded. Fixed in 4.21.1.

Overall risk
36/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.17%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Timeline

  1. 29-08-2026
    PublishedVulnerability first disclosed.
  2. 30-08-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.17%

Chance of exploitation in the next 30 days

Percentile

6%

Versus all other CVEs

30-day change

0.00 pp

From 0.17% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.17%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (wpscan.com)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Unknown1 product
Wordpress1 product
  • mstore-api< 4.21.1

2 vendors · 2 products

References

2 links