6.5

CVE-2026-18603: unknown piweb cancel order / refund request for woocommerce Missing Authorization

CVSS: 6.5v3.1MediumDeferred
Published 09-08-2026Last modified 10-08-2026
Open JSON

Vulnerability summary

CVE-2026-18603 is a medium (CVSS 6.5) Missing Authorization vulnerability in unknown piweb cancel order / refund request for woocommerce. EPSS estimates a 0.30% chance of exploitation in the next 30 days, higher than 21.4% of scored vulnerabilities. 1 public exploit is recorded. Fixed in 1.3.4.34.

Overall risk
36/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.30%
0%100%
Low · +0.06 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Timeline

  1. 09-08-2026
    PublishedVulnerability first disclosed.
  2. 10-08-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.30%

Chance of exploitation in the next 30 days

Percentile

21%

Versus all other CVEs

30-day change

+0.06 pp

From 0.24% on 22-09-2026

22-09-202622-10-2026
EPSS score
0.30%

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
  • cancel-order-request-woocommerce≤ 1.3.4.33 (fixed in 1.3.4.34)

2 vendors · 2 products

References

2 links