MasterStudy LMS < 3.7.40 - Unauthenticated Payment Bypass via PayPal IPN
Priority LOW 21CWE-284Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-284.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00223 13th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed MasterStudy LMS WordPress Plugin (Unknown): 3.7.40
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Unknown | MasterStudy LMS WordPress Plugin | before 3.7.40 | 3.7.40 | Patch available | CNA |
- MasterStudy LMS WordPress Plugin VendorUnknown Affected before 3.7.40 Fixed in 3.7.40 Patch available CNA
Remediation
- Fix · CNA MasterStudy LMS WordPress Plugin (Unknown) Fixed in 3.7.40
Timeline
- 2026-10-02 Threatist record created from CVE-2026-81026
- 2026-10-03 Alias added: GHSA-26xx-gp3p-fv9p
References
Sources
- CVE-2026-81026 · CVE Program
- CVE-2026-81026 · NVD
- FIRST EPSS
- GHSA-26xx-gp3p-fv9p · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences