{"id":"CVE-2026-103646","revision":"f837d71fc7004c31b68218af8f96ba92","records":[{"revision":"f837d71fc7004c31b68218af8f96ba92","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-103646","aliases":[],"title":"Ultimate Multisite < 2.17.0 - Unauthenticated Authentication Bypass via 'email_address' Parameter","description":"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.","state":0,"publishedAt":"2026-10-08T06:00:05.353+00:00","modifiedAt":"2026-10-08T10:59:19.784+00:00","affected":[{"ecosystem":"Vendor product","name":"Ultimate Multisite","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Unknown\",\n                    \"product\": \"Ultimate Multisite\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.17.0\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[],"references":["https://wpscan.com/vulnerability/a05da0ad-5d92-406f-b182-b3ed1f8389f3/"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-103646","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-103646","identifiers":["CVE-2026-103646"]},"retained":false,"historicalAffected":[]}],"coverage":[]}