{
    "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"
            }
        }
    }
}