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CVE-2026-103646

CRITICAL 9.8 CVSS 3.1
Published
October 8, 2026
Last modified
October 8, 2026
NVD status
Deferred
Reported by
contact@wpscan.com
Weakness
CWE-287
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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. This 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.

Affected WordPress components

  • Ultimate Multisite – WordPress Multisite SaaS & WaaS Platform Plugin · ultimate-multisite
    Confirmed match Active
    Before 2.17.0
    View on WordPress.org

A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.

Affected products and versions

  • Unknown Ultimate Multisite — Before 2.17.0

References

  • wpscan.com https://wpscan.com/vulnerability/a05da0ad-5d92-406f-b182-b3ed1f8389f3/
  • nvd.nist.gov Official NVD record