CVE-2026-11961highCWE-269

CVE-2026-11961: high-severity vulnerability in User Registration & Membership

User Registration & Membership < 5.2.3 - Unauthenticated Privilege Escalation via Unbound members_data Membership ID

Published

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41Vexday Risk Score

No sign of exploitation. It has a public proof of concept.

ssvc Attendcvss 8.1epss 0.4%
from disclosure to weapon21 days
Published on NVDJul 17
1st PoC+21d
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:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
Unknown · User Registration & Membership
⚠ 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 49.1%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%