Vulnerability in Casso Flow

CVE-2026-103382

The Casso Flow WordPress plugin before 4.2.0 does not properly authenticate incoming bank-transfer payment notifications, as the token used to verify them is empty on a default installation, allowing unauthenticated attackers to forge a notification and mark any pending WooCommerce order as paid, regardless of its payment method.

Published · last modified .

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.

EPSS exploit prediction

EPSS: 0.002 (4.4th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 4th percentile — 4.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

The 30-day trend appears once there are two daily scores.

Affected products

  • Casso Flow

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-103382?
CVE-2026-103382 is a medium-severity vulnerability in Casso Flow, classified under Improper Access Control. CVSS score: 5.3/10. Published 2026-10-28.
How severe is CVE-2026-103382?
Medium severity. CVSS v3 base score is 5.3 out of 10.