{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-11964","assignerOrgId":"1bfdd5d7-9bf6-4a53-96ea-42e2716d7a81","state":"PUBLISHED","assignerShortName":"WPScan","dateReserved":"2026-06-11T08:46:05.907Z","datePublished":"2026-07-13T06:00:01.573Z","dateUpdated":"2026-07-13T15:52:54.768Z"},"containers":{"cna":{"providerMetadata":{"orgId":"1bfdd5d7-9bf6-4a53-96ea-42e2716d7a81","shortName":"WPScan","dateUpdated":"2026-07-13T06:00:01.573Z"},"title":"User Registration & Membership < 5.2.2 - Unauthenticated PayPal Webhook Signature Verification Bypass Leading to Membership Activation","problemTypes":[{"descriptions":[{"description":"CWE-287 Improper Authentication","lang":"en","type":"CWE"}]}],"affected":[{"vendor":"Unknown","product":"User Registration & Membership","versions":[{"status":"affected","versionType":"semver","version":"0","lessThan":"5.2.2"}],"defaultStatus":"unaffected"}],"descriptions":[{"lang":"en","value":"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."}],"references":[{"url":"https://wpscan.com/vulnerability/faf55649-8f76-4abf-a6b9-0d0774e22d29/","tags":["exploit","vdb-entry","technical-description"]}],"credits":[{"lang":"en","value":"Alessandro Greco aka Aleff","type":"finder"},{"lang":"en","value":"Giovanbattista Ianni (University of Calabria - UNICAL)","type":"finder"},{"lang":"en","value":"WPScan","type":"coordinator"}],"source":{"discovery":"EXTERNAL"},"x_generator":{"engine":"WPScan CVE Generator"}},"adp":[{"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":9.1,"attackVector":"NETWORK","baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"NONE","privilegesRequired":"NONE","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-07-13T15:50:37.786921Z","id":"CVE-2026-11964","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-07-13T15:52:54.768Z"}}]}}