CVE-2026-11964: CWE-287 Improper Authentication in User Registration & Membership
The User Registration & Membership WordPress plugin before 5.2.2 does not verify the authenticity of incoming payment-provider webhook notifications before acting on them, allowing unauthenticated attackers to forge a payment-approved event and activate a paid membership subscription without completing a real payment.
AI Analysis
Technical Summary
CVE-2026-11964 describes an improper authentication vulnerability (CWE-287) in the User Registration & Membership WordPress plugin versions prior to 5.2.2. The plugin fails to verify the authenticity of payment-provider webhook notifications before processing them. As a result, attackers can send forged payment-approved events to the plugin, causing it to activate paid membership subscriptions fraudulently without real payment confirmation.
Potential Impact
Successful exploitation allows attackers to bypass payment verification and gain unauthorized access to paid membership subscriptions. This can lead to revenue loss for site operators and unauthorized access to subscription-restricted content or services.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should monitor for updates from the plugin vendor and avoid relying on this plugin version for payment processing. Implementing additional webhook verification mechanisms externally may reduce risk.
CVE-2026-11964: CWE-287 Improper Authentication in User Registration & Membership
Description
The User Registration & Membership WordPress plugin before 5.2.2 does not verify the authenticity of incoming payment-provider webhook notifications before acting on them, allowing unauthenticated attackers to forge a payment-approved event and activate a paid membership subscription without completing a real payment.
CVSS v3.1
Score 9.1critical
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-11964 describes an improper authentication vulnerability (CWE-287) in the User Registration & Membership WordPress plugin versions prior to 5.2.2. The plugin fails to verify the authenticity of payment-provider webhook notifications before processing them. As a result, attackers can send forged payment-approved events to the plugin, causing it to activate paid membership subscriptions fraudulently without real payment confirmation.
Potential Impact
Successful exploitation allows attackers to bypass payment verification and gain unauthorized access to paid membership subscriptions. This can lead to revenue loss for site operators and unauthorized access to subscription-restricted content or services.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should monitor for updates from the plugin vendor and avoid relying on this plugin version for payment processing. Implementing additional webhook verification mechanisms externally may reduce risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-06-11T08:46:05.907Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a5486ae68715ace4350e259
Added to database: 07/13/2026, 06:33:18 UTC
Last enriched: 07/13/2026, 06:48:26 UTC
Last updated: 07/13/2026, 19:47:35 UTC
Views: 4
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