{"id":"CVE-2026-11964","aliases":["EUVD-2026-43285","GHSA-6f2x-47pc-8mpq"],"status":"published","title":"User Registration \u0026 Membership \u003c 5.2.2 - Unauthenticated PayPal Webhook Signature Verification Bypass Leading to Membership Activation","description":"The User Registration \u0026 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.","severity":{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-10","score":0.00454,"percentile":0.39723,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2026-07-13T06:00:01Z","modified":"2026-07-13T18:31:48Z","products":[{"vendor":"unknown","product":"user registration \u0026 membership"}],"references":[{"url":"https://wpscan.com/vulnerability/faf55649-8f76-4abf-a6b9-0d0774e22d29/","tags":["exploit","vdb-entry","technical-description"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-11964"},{"url":"https://wpscan.com/vulnerability/faf55649-8f76-4abf-a6b9-0d0774e22d29"},{"url":"https://github.com/advisories/GHSA-6f2x-47pc-8mpq"}],"sources":{"cve":[{"id":"CVE-2026-11964","title":"User Registration \u0026 Membership \u003c 5.2.2 - Unauthenticated PayPal Webhook Signature Verification Bypass Leading to Membership Activation","description":"The User Registration \u0026 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.","status":"published","published":"2026-07-13T06:00:01.573Z","modified":"2026-07-13T15:52:54.768Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"adp"}],"updated_at":"2026-11-02T14:20:04.809935Z"}],"euvd":[{"id":"EUVD-2026-43285","description":"The User Registration \u0026 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.","status":"published","published":"2026-07-13T06:00:01Z","modified":"2026-07-13T15:52:54Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"updated_at":"2026-11-02T18:20:01.519776Z"}],"ghsa":[{"id":"GHSA-6f2x-47pc-8mpq","title":"The User Registration \u0026 Membership  WordPress plugin before 5.2.2 does not verify the...","description":"The User Registration \u0026 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.","status":"published","published":"2026-07-13T09:31:41Z","modified":"2026-07-13T18:31:48Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"updated_at":"2026-11-02T15:09:26.474991Z"}],"nvd":[{"id":"CVE-2026-11964","description":"The User Registration \u0026 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.","status":"published","published":"2026-07-13T07:16:27.42Z","modified":"2026-07-13T18:05:36.13Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"secondary"}],"updated_at":"2026-11-02T14:12:28.771746Z"}]}}