CVE-2026-11963: high-severity vulnerability in User Registration & Membership
User Registration & Membership < 5.2.2 - Subscriber+ Cross-User Role and Membership Tier Modification via IDOR
Published
41Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 8.1epss 0.4%
exploitation probability
0.4%top 73% of all CVEs
observed exploitation
nono source reports it
1 public exploit(s)
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:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Affected products
Unknown · User Registration & Membershippublic PoCs found — 1
cve_referencewpscan.com/vulnerability/a34a916a-983e-48a5-8f10-99214ee3b613/unverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — User Registration & Membership
In the same product, most dangerous first.
CVE-2025-2563HIGHUser Registration & Membership < 4.1.2- Unauthenticated Privilege EscalationEPSS 48.8%CVE-2025-2594HIGHUser Registration & Membership < 4.1.3 - Authentication BypassEPSS 9.5%CVE-2026-80071HIGHUser Registration & Membership < 5.2.8 - Author+ Privilege Escalation to AdministratorEPSS 0.5%CVE-2026-79996HIGHUser Registration & Membership < 5.2.6 - Authenticated Privilege Escalation via Login SettingsEPSS 0.5%CVE-2026-11964CRITICALUser Registration & Membership < 5.2.2 - Unauthenticated PayPal Webhook Signature Verification Bypass Leading to Membership ActivationEPSS 0.5%CVE-2026-16736HIGHUser Registration & Membership < 5.2.6 - Unauthenticated Account Creation While Registration DisabledEPSS 0.4%