High severity · published Jul 13, 2026
CVE-2026-11963
User Registration & Membership < 5.2.2 - Subscriber+ Cross-User Role and Membership Tier Modification via IDOR
8.1
CVSS
0.4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 29% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
UR
User Registration & Membership ·
before 5.2.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-11963
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-11963
wpscan.com
https://wpscan.com/vulnerability/a34a916a-983e-48a5-8f10-99214ee3b613/
More from User Registration & Membership
9.1
CVE-2026-11964
User Registration & Membership < 5.2.2 - Unauthenticated PayPal Webhook Signature Verification Bypass Leading to Membership Activation
8.1
CVE-2026-11961
User Registration & Membership < 5.2.3 - Unauthenticated Privilege Escalation via Unbound members_data Membership ID
8.1
CVE-2025-2594
User Registration & Membership < 4.1.3 - Authentication Bypass
8.1
CVE-2025-2563
User Registration & Membership < 4.1.2- Unauthenticated Privilege Escalation
7.5
CVE-2026-86406
User Registration & Membership < 5.2.8 - Subscriber+ Privilege Escalation via Membership Purchase