{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-103646", "assignerOrgId": "1bfdd5d7-9bf6-4a53-96ea-42e2716d7a81", "state": "PUBLISHED", "assignerShortName": "WPScan", "dateReserved": "2026-10-01T06:42:15.491Z", "datePublished": "2026-10-08T06:00:05.353Z", "dateUpdated": "2026-10-08T06:00:05.353Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "1bfdd5d7-9bf6-4a53-96ea-42e2716d7a81", "shortName": "WPScan", "dateUpdated": "2026-10-08T06:00:05.353Z"}, "title": "Ultimate Multisite < 2.17.0 - Unauthenticated Authentication Bypass via 'email_address' Parameter", "problemTypes": [{"descriptions": [{"description": "CWE-287 Improper Authentication", "lang": "en", "type": "CWE"}]}], "affected": [{"vendor": "Unknown", "product": "Ultimate Multisite", "versions": [{"status": "affected", "versionType": "semver", "version": "0", "lessThan": "2.17.0"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "The Ultimate Multisite WordPress plugin before 2.17.0 does not require authentication before a logged-out checkout is linked to, and logged in as, an existing WordPress account matching the submitted email address, and its duplicate-account check normalizes that address differently from the lookup used to create the customer, so an unauthenticated attacker can log in as any existing user, including a Network Super Admin, whose email address they know.\nThis bypass is not addressed by the 2.15.1 fix for CVE-2026-75957 and remains exploitable in all versions up to and including 2.16.1, the releases that fix was expected to cover. Exploitation requires a checkout form configured without a password field (auto-generated password) and a target account that has no existing customer record in the Ultimate Multisite WordPress plugin before 2.17.0."}], "references": [{"url": "https://wpscan.com/vulnerability/a05da0ad-5d92-406f-b182-b3ed1f8389f3/", "tags": ["exploit", "vdb-entry", "technical-description"]}], "credits": [{"lang": "en", "value": "Erwan LR (WPScan)", "type": "finder"}, {"lang": "en", "value": "WPScan", "type": "coordinator"}], "source": {"discovery": "EXTERNAL"}, "x_generator": {"engine": "WPScan CVE Generator"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Ultimate Multisite", "vendor": "Unknown", "versions": [{"lessThan": "2.17.0", "status": "affected", "version": "0", "versionType": "semver"}]}], "source": "contact@wpscan.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "The Ultimate Multisite WordPress plugin before 2.17.0 does not require authentication before a logged-out checkout is linked to, and logged in as, an existing WordPress account matching the submitted email address, and its duplicate-account check normalizes that address differently from the lookup used to create the customer, so an unauthenticated attacker can log in as any existing user, including a Network Super Admin, whose email address they know.\nThis bypass is not addressed by the 2.15.1 fix for CVE-2026-75957 and remains exploitable in all versions up to and including 2.16.1, the releases that fix was expected to cover. Exploitation requires a checkout form configured without a password field (auto-generated password) and a target account that has no existing customer record in the Ultimate Multisite WordPress plugin before 2.17.0."}], "id": "CVE-2026-103646", "lastModified": "2026-10-08T06:16:37.957", "metrics": {}, "published": "2026-10-08T06:16:37.957", "references": [{"source": "contact@wpscan.com", "url": "https://wpscan.com/vulnerability/a05da0ad-5d92-406f-b182-b3ed1f8389f3/"}], "sourceIdentifier": "contact@wpscan.com", "vulnStatus": "Received"}

{}

{}