Auth bypass in Piweb Cancel Order / Refund Request For Woocommerce

CVE-2026-18603

The PiWeb Cancel order / Refund request for WooCommerce WordPress plugin before 1.3.4.34 does not have authorization or ownership checks when adding the contents of a previous order to the cart, allowing unauthenticated users to disclose the contents of other customers' orders, as well as to clear and repopulate a logged in user's cart via a crafted link.

Vulnerability class: Broken Access Control

Published · last modified .

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.002 (15.7th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 15.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-18603: held from 0.002 to 0.002.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

  • Piweb Cancel Order / Refund Request For Woocommerce — versions 0

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-18603?
CVE-2026-18603 is a medium-severity vulnerability in Piweb Cancel Order / Refund Request For Woocommerce, classified under Missing Authorization. CVSS score: 6.5/10. Published 2026-08-09.
How severe is CVE-2026-18603?
Medium severity. CVSS v3 base score is 6.5 out of 10.