Simple Membership < 4.7.7 - Unauthenticated Payment Bypass via Missing PayPal IPN Receiver Verification
Priority MEDIUM 63CWE-345Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-345.
Summary
The Simple Membership WordPress plugin before 4.7.7 does not verify that a PayPal payment notification was sent to the site's own configured merchant account before activating a membership, allowing unauthenticated users to activate or extend a membership using a payment made to an arbitrary PayPal account they control.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00163 5th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed Simple Membership (Unknown): 4.7.7
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- 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 | Simple Membership | before 4.7.7 | 4.7.7 | Patch available | CNA |
- Simple Membership VendorUnknown Affected before 4.7.7 Fixed in 4.7.7 Patch available CNA
Remediation
- Fix · CNA Simple Membership (Unknown) Fixed in 4.7.7
Timeline
- 2026-10-02 Threatist record created from CVE-2026-14936
- 2026-10-03 Alias added: GHSA-rx87-886c-g6fw
References
Sources
- CVE-2026-14936 · CVE Program
- CVE-2026-14936 · NVD
- FIRST EPSS
- GHSA-rx87-886c-g6fw · GitHub Advisory Database · CC BY 4.0
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