Medium severity · published Aug 29, 2026
CVE-2026-81026
MasterStudy LMS < 3.7.40 - Unauthenticated Payment Bypass via PayPal IPN
4.8
CVSS
0.2%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 13% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ML
MasterStudy LMS WordPress Plugin ·
before 3.7.40 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-81026
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-81026
wpscan.com
https://wpscan.com/vulnerability/6677b55c-5d51-4849-ac67-849a500aefe2/
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