CVE-2026-75957 | The Ultimate Multisite – WordPress Multisite SaaS & WaaS Platform plugin for WordPress is vulnerable to Authentication Bypass in all versions up to, and including, 2.15.0 via the `checkout_form` parameter of the `login_customer_after_checkout` function. This is due to the publicly accessible `wu_ajax_nopriv_wu_validate_form` AJAX handler accepting a freely obtainable checkout nonce, and the `checkout_form=wu-finish-checkout` parameter causing `get_validation_
The Ultimate Multisite – WordPress Multisite SaaS & WaaS Platform plugin for WordPress is vulnerable to Authentication Bypass in all versions up to, and including, 2.15.0 via the `checkout_form` parameter of the `login_customer_after_checkout` function. This is due to the publicly accessible `wu_ajax_nopriv_wu_validate_form` AJAX handler accepting a freely obtainable checkout nonce, and the `checkout_form=wu-finish-checkout` parameter causing `get_validation_rules()` to discard all validation rules while `finish_checkout_form_fields()` returns an empty step list — forcing `is_last_step()` to return true and routing the request directly into full order processing — after which `maybe_create_customer()` resolves the attacker-supplied `email_address` to an existing WordPress user ID without any authentication or ownership verification, and `login_customer_after_checkout()` calls `wp_set_auth_cookie()` for that user ID via a passwordless code path. This makes it possible for unauthenticated attackers to log in as any existing WordPress user — including a Network Super Admin — simply by knowing their email address. Exploitation requires that the targeted user account has no pre-existing Ultimate Multisite customer record; accounts such as a Network Super Admin on a fresh Multisite install, or any administrator or editor added before Ultimate Multisite was configured, satisfy this condition and are therefore exploitable.
- 🔗 www.wordfence.com/threat-intel/vulnerabilities/id/66cb8c6f-…
- 🔗 plugins.trac.wordpress.org/browser/ultimate-multisite/tags/2.15.0/in…
- 🔗 plugins.trac.wordpress.org/browser/ultimate-multisite/tags/2.15.0/in…
- 🔗 plugins.trac.wordpress.org/browser/ultimate-multisite/tags/2.15.0/in…
- 🔗 plugins.trac.wordpress.org/browser/ultimate-multisite/tags/2.15.0/in…
- 🔗 plugins.trac.wordpress.org/browser/ultimate-multisite/tags/2.15.0/in…
- 🔗 plugins.trac.wordpress.org/browser/ultimate-multisite/tags/2.14.2/in…
- 🔗 plugins.trac.wordpress.org/browser/ultimate-multisite/tags/2.14.2/in…
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📊 Historien-Charts — Criticals-Trend · Vendors · EPSS-Verteilung
| Tier | CVEs | Anteil |
|---|---|---|
| ≥90 % | 725 | 0,2 % |
| ≥50 % | 3.220 | 0,9 % |
| ≥10 % | 22.091 | 5,9 % |
| <10 % | 347.646 | 93,0 % |
CVE-2026-75957 | The Ultimate Multisite – WordPress Multisite SaaS & WaaS Platform plugin for WordPress is vulnerable to Authentication Bypass in all versions up to, and including, 2.15.0 via the `checkout_form` parameter of the `login_customer_after_checkout` function. This is due to the publicly accessible `wu_ajax_nopriv_wu_validate_form` AJAX handler accepting a freely obtainable checkout nonce, and the `checkout_form=wu-finish-checkout` parameter causing `get_validation_
The Ultimate Multisite – WordPress Multisite SaaS & WaaS Platform plugin for WordPress is vulnerable to Authentication Bypass in all versions up to, and including, 2.15.0 via the `checkout_form` parameter of the `login_customer_after_checko
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