What is CVE-2026-13399?

CVE-2026-13399 is a high-severity vulnerability in Payment Plugins For Paypal Woocommerce, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 7.5/10. Published 2026-08-06.

How severe is CVE-2026-13399?

High severity. CVSS v3 base score is 7.5 out of 10.

Auth bypass in Payment Plugins For Paypal Woocommerce

CVE-2026-13399

The Payment Plugins for PayPal WooCommerce WordPress plugin before 2.0.20 does not have proper authorization checks on a REST endpoint, allowing unauthenticated users to bypass payments

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published 2026-08-06 · last modified 2026-08-26.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (34.3th percentile), scored 2026-11-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Payment Plugins For Paypal Woocommerce — versions 0

Weakness classification (CWE)

References

wpscan.com/vulnerability/6ae19ba0-26ba-4ffa-94e3-3fe32cedcae1/ (technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2026-13399?: CVE-2026-13399 is a high-severity vulnerability in Payment Plugins For Paypal Woocommerce, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 7.5/10. Published 2026-08-06.
How severe is CVE-2026-13399?: High severity. CVSS v3 base score is 7.5 out of 10.