What is CVE-2021-47933?

CVE-2021-47933 is a critical-severity vulnerability in Mstore API, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2026-05-10.

How severe is CVE-2021-47933?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Mstore API

CVE-2021-47933

WordPress MStore API 2.0.6 contains an arbitrary file upload vulnerability that allows unauthenticated attackers to upload malicious files by sending POST requests to the REST API endpoint. Attackers can upload PHP files with arbitrary names to the config_file endpoint to achieve remote code execution on the server.

Vulnerability class: Broken Authentication

Published 2026-05-10 · last modified 2026-07-25.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (45.9th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 45.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Mstore API — versions 2.0.6

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

www.exploit-db.com/exploits/50379 (exploit)
wordpress.org/plugins/mstore-api/ (product)
www.vulncheck.com/advisories/wordpress-mstore-api-arbitrary-file-upload (third-party-advisory)

Frequently asked questions

What is CVE-2021-47933?: CVE-2021-47933 is a critical-severity vulnerability in Mstore API, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2026-05-10.
How severe is CVE-2021-47933?: Critical severity. CVSS v3 base score is 9.8 out of 10.