CVE-2026-14936: CWE-345 Insufficient Verification of Data Authenticity in Simple Membership
A vulnerability in the Simple Membership WordPress plugin before version 4.7.7 allows unauthenticated users to activate or extend memberships by exploiting insufficient verification of PayPal payment notifications. The plugin does not confirm that the payment notification was sent to the site's configured merchant account, enabling attackers to use payments made to arbitrary PayPal accounts they control.
AI Analysis
Technical Summary
CVE-2026-14936 is a CWE-345 Insufficient Verification of Data Authenticity vulnerability affecting the Simple Membership WordPress plugin versions prior to 4.7.7. The flaw arises because the plugin fails to verify that PayPal payment notifications correspond to the site's own merchant account before activating or extending memberships. This allows unauthenticated attackers to activate or extend memberships by submitting payment notifications tied to arbitrary PayPal accounts they control, bypassing intended payment verification.
Potential Impact
The vulnerability allows an unauthenticated attacker to fraudulently activate or extend memberships without making legitimate payments to the site’s merchant account. This results in unauthorized membership access extensions, potentially impacting the integrity of membership management and revenue.
Mitigation Recommendations
No official patch or remediation level is currently confirmed. Users should upgrade to Simple Membership version 4.7.7 or later once available, as the vulnerability affects versions before 4.7.7. Until a fix is released, administrators should consider disabling PayPal payment processing or implementing additional verification controls outside the plugin to ensure payment authenticity.
CVE-2026-14936: CWE-345 Insufficient Verification of Data Authenticity in Simple Membership
Description
A vulnerability in the Simple Membership WordPress plugin before version 4.7.7 allows unauthenticated users to activate or extend memberships by exploiting insufficient verification of PayPal payment notifications. The plugin does not confirm that the payment notification was sent to the site's configured merchant account, enabling attackers to use payments made to arbitrary PayPal accounts they control.
CVSS v3.1
Score 5.3medium
Affected software
Simple Membership
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-14936 is a CWE-345 Insufficient Verification of Data Authenticity vulnerability affecting the Simple Membership WordPress plugin versions prior to 4.7.7. The flaw arises because the plugin fails to verify that PayPal payment notifications correspond to the site's own merchant account before activating or extending memberships. This allows unauthenticated attackers to activate or extend memberships by submitting payment notifications tied to arbitrary PayPal accounts they control, bypassing intended payment verification.
Potential Impact
The vulnerability allows an unauthenticated attacker to fraudulently activate or extend memberships without making legitimate payments to the site’s merchant account. This results in unauthorized membership access extensions, potentially impacting the integrity of membership management and revenue.
Mitigation Recommendations
No official patch or remediation level is currently confirmed. Users should upgrade to Simple Membership version 4.7.7 or later once available, as the vulnerability affects versions before 4.7.7. Until a fix is released, administrators should consider disabling PayPal payment processing or implementing additional verification controls outside the plugin to ensure payment authenticity.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-07-07T11:50:26.844Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a7506f5bf8831d5395f5453
Added to database: 08/06/2026, 22:13:09 UTC
Last enriched: 08/14/2026, 16:20:36 UTC
Last updated: 09/21/2026, 22:01:32 UTC
Views: 27
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