CVE-2026-11964 | BDVDB-2026-347205 Detail

User Registration & Membership

Description#

The User Registration & Membership WordPress plugin before 5.2.2 does not verify the authenticity of incoming payment-provider webhook notifications before acting on them, allowing unauthenticated attackers to forge a payment-approved event and activate a paid membership subscription without completing a real payment.

Impact#

Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact none. Attack vector: network.

Weaknesses#

CWE-287 Improper Authentication

References#

https://wpscan.com/vulnerability/faf55649-8f76-4abf-a6b9-0d0774e22d29/

Exploit#

https://wpscan.com/vulnerability/faf55649-8f76-4abf-a6b9-0d0774e22d29/

History#

Version 12026-07-13Record published in the CVE List.

Published

Published: 2026-07-13
Last modified: 2026-07-13

Vendor information

Vendor: Not stated
Product: User Registration & Membership

Score

9.1 Critical

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 39.7.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Authentication Issues

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
< 5.2.2
Fixed
5.2.2

Scoring System

CVSS v4.0

Not available

CVSS v3.1

9.1 Critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Privileges Required	None
User Interaction	None
Scope	Unchanged
Confidentiality	High
Integrity	High
Availability	None

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).