CVE-2026-81026

MasterStudy LMS < 3.7.40 - Unauthenticated Payment Bypass via PayPal IPN

The MasterStudy LMS WordPress Plugin WordPress plugin before 3.7.40 does not verify the amount, receiver, currency or status of a payment notification before marking the corresponding order completed, allowing unauthenticated users to complete full-price orders and gain access to paid content by paying only a token amount.

Affected

MasterStudy LMS WordPress Plugin

CVSS v3.1 CNA

4.8 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

EPSS

0.22% chance of exploitation in the next 30 days, 12th percentile

Published

2026-08-29

Updated

2026-08-30

Proof-of-concept exploits (1)

• https://wpscan.com/vulnerability/6677b55c-5d51-4849-ac67-849a500aefe2/

References

• CVE Record
• NVD entry