CVE-2026-11963

User Registration & Membership < 5.2.2 - Subscriber+ Cross-User Role and Membership Tier Modification via IDOR

The User Registration & Membership WordPress plugin before 5.2.2 does not perform an authorization check on a membership-upgrade action and derives the user to modify from a caller-supplied identifier instead of the current user, allowing any authenticated user such as a subscriber to change another user's WordPress role and membership tier.

We have discovered 6,601 live websites that are affected by CVE-2026-11963.

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Affected Software

Product  User Registration
Category Wordpress Plugins
Vulnerable Domains6,601 live websites (92% of User Registration install base)
Vulnerable Versions
  • from 0 through 5.2.2
Vulnerable Versions Count140 versions ( 98% of all versions)


Common Weakness Enumeration

CWE-639 Authorization Bypass Through User-Controlled Key



Details

  • Published - Jul 13, 2026
  • Updated - Jul 13, 2026

Credits

  • Revanth Hari Narayana Matte (finder)
  • WPScan (coordinator)

Website Distribution by Country

Number of websites using CVE-2026-11963
United States1,855 websites


Italy510 websites
Germany499 websites
GB329 websites
France309 websites
Spain258 websites
Brazil168 websites
Canada157 websites
Cyprus157 websites
India151 websites

Website Distribution by TLD

Number of websites using CVE-2026-11963
.com2,664 websites
.org459 websites
.it393 websites
.de193 websites
.co.uk152 websites
.com.br152 websites
.net140 websites
.com.au135 websites
.nl124 websites
.fr110 websites

Vulnerable Versions

Vulnerable versions are highlighted in red

Websites affected by CVE-2026-11963

Top websites that are affected by CVE-2026-11963. Please click on the "Contact us" link to get more information.
DomainCountryRankContacts
****************.com France**,***
*********.com United States**,***
******.***.my Malaysia**,***
************.com United States**,***
*************.com United States**,***
********.de Germany**,***
************.**.il Israel**,***
*************.com United States**,***
***.**.th Thailand**,***
********.com United States***,***
See full domain list

FAQ

CVE-2026-11963 is Authorization Bypass Through User-Controlled Key in User Registration
A total of 6,601 websites have been identified as vulnerable to CVE-2026-11963, based on global website indexing conducted by WebTechSurvey.
The User Registration is affected by the CVE-2026-11963 vulnerability.
User Registration versions up to 5.2.2 are vulnerable to CVE-2026-11963.
CVE-2026-11963 is resolved in version 5.2.2 of User Registration.