Vulnerability in Payment Button For Paypal

CVE-2026-16990

The Payment Button for PayPal WordPress plugin through 1.2.3.44 does not enforce the merchant-configured price server-side and trusts a client-supplied payment amount, allowing unauthenticated attackers to create a real PayPal order against the merchant for an arbitrary lower amount.

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: 0.003 (22.8th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 22.8% 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-2026-16990: held from 0.002 to 0.003.

EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001

Affected products

  • Payment Button For Paypal — versions 0

References

Frequently asked questions

What is CVE-2026-16990?
CVE-2026-16990 is a medium-severity vulnerability in Payment Button For Paypal, classified under CWE-602 CLIENT-SIDE ENFORCEMENT OF SERVER-SIDE SECURITY. CVSS score: 5.3/10. Published 2026-08-12.
How severe is CVE-2026-16990?
Medium severity. CVSS v3 base score is 5.3 out of 10.