High severity · published Jul 17, 2026
CVE-2026-11961
User Registration & Membership < 5.2.3 - Unauthenticated Privilege Escalation via Unbound members_data Membership ID
8.1
CVSS
0.4%
EPSS
No
On KEV
Description
The User Registration & Membership WordPress plugin before 5.2.3 does not validate that the membership tier submitted during public registration is one of the tiers allowed by the registration form before assigning that tier's associated user role, allowing unauthenticated users to register into an arbitrary published membership tier and obtain its role — up to administrator when such a tier exists.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 32% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
UR
User Registration & Membership ·
before 5.2.3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-11961
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-11961
wpscan.com
https://wpscan.com/vulnerability/2ffab574-8626-472e-b6e4-09bcbaa62349/
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