What is CVE-2026-83533?

CVE-2026-83533 is a medium-severity vulnerability in Wp Express Checkout, classified under Insufficient Verification of Data Authenticity. CVSS score: 5.3/10. Published 2026-09-02.

How severe is CVE-2026-83533?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Wp Express Checkout

CVE-2026-83533

The WP Express Checkout WordPress plugin before 2.4.9 does not verify server-side that a payment was actually completed before marking an order as paid, allowing unauthenticated users to forge a completed order without paying.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

Affected products

Unknown Wp Express Checkout

Weakness classification (CWE)

CWE-345 — Insufficient Verification of Data Authenticity

References

contact@wpscan.com (technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2026-83533?: CVE-2026-83533 is a medium-severity vulnerability in Wp Express Checkout, classified under Insufficient Verification of Data Authenticity. CVSS score: 5.3/10. Published 2026-09-02.
How severe is CVE-2026-83533?: Medium severity. CVSS v3 base score is 5.3 out of 10.