CVE-2026-11966

User Registration & Membership < 5.2.3 - Unauthenticated Limited User Deletion via Stripe Subscription Handler

The User Registration & Membership WordPress plugin before 5.2.3 does not perform a capability check for unauthenticated callers on one of its membership payment actions and acts on a caller-supplied user identifier, allowing unauthenticated attackers to delete recently-registered, payment-pending user accounts.

We have discovered 4,010 live websites that are affected by CVE-2026-11966.

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Affected Software

Product  User Registration
Category Wordpress Plugins
Vulnerable Domains4,010 live websites (56% of User Registration install base)
Vulnerable Versions
  • from 4.2.3 through 5.2.3
Vulnerable Versions Count27 versions ( 19% of all versions)


Common Weakness Enumeration

CWE-639 Authorization Bypass Through User-Controlled Key



Details

  • Published - Jul 17, 2026
  • Updated - Jul 17, 2026

Credits

  • Daniel Púa - devploit (finder)
  • WPScan (coordinator)

Website Distribution by Country

Number of websites using CVE-2026-11966
United States1,305 websites


Germany294 websites
Italy252 websites
GB228 websites
France174 websites
Spain146 websites
Cyprus116 websites
Canada105 websites
Australia98 websites
Brazil98 websites

Website Distribution by TLD

Number of websites using CVE-2026-11966
.com1,692 websites
.org291 websites
.it204 websites
.de130 websites
.co.uk115 websites
.net92 websites
.com.br90 websites
.com.au86 websites
.nl81 websites
.ca66 websites

Vulnerable Versions

Vulnerable versions are highlighted in red

Websites affected by CVE-2026-11966

Top websites that are affected by CVE-2026-11966. Please click on the "Contact us" link to get more information.
DomainCountryRankContacts
*********.com United States**,***
******.***.my Malaysia**,***
*************.com United States**,***
************.**.il Israel**,***
*************.com United States**,***
************************.com United States***,***
*************.com United States***,***
***************.com United States***,***
********.it United States***,***
*****************.com South Africa***,***
See full domain list

FAQ

CVE-2026-11966 is Authorization Bypass Through User-Controlled Key in User Registration
A total of 4,010 websites have been identified as vulnerable to CVE-2026-11966, based on global website indexing conducted by WebTechSurvey.
The User Registration is affected by the CVE-2026-11966 vulnerability.
User Registration versions up to 5.2.3 are vulnerable to CVE-2026-11966.
CVE-2026-11966 is resolved in version 5.2.3 of User Registration.