CVE-2026-75957— Ultimate Multisite <= 2.15.0 - Unauthenticated Authentication Bypass via 'checkout_form' Parameter
一分钟漏洞结论
影响对象
superdav42 Ultimate Multisite – WordPress Multisite SaaS & WaaS Platform
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
WordPress 插件 “The Ultimate Multisite – WordPress Multisite SaaS & WaaS Platform” 在包括 2.15.0 在内的所有版本中均存在身份验证绕过漏洞。该漏洞可通过 函数中的 参数被利用。 漏洞成因如下：公开可访问的 AJAX 处理程序 接受一个可自由获取的结账 nonce（一次性令牌）。当请求中包含 参数时， 函数会丢弃所有验证规则，同时 返回一个空的步骤列表。这导致 函数强制返回 true，从而将请求直接路由至完整的订单处理流程。随后， 函
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一、 漏洞 CVE-2026-75957 基础信息
漏洞信息
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Vulnerability Title
Ultimate Multisite <= 2.15.0 - Unauthenticated Authentication Bypass via 'checkout_form' Parameter
来源: CVE Program / CVE List V5
Vulnerability Description
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.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
来源: CVE Program / CVE List V5
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| superdav42 | Ultimate Multisite – WordPress Multisite SaaS & WaaS Platform | 0 ~ 2.15.0 | - |
|
二、漏洞 CVE-2026-75957 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-75957 其他参考 (13)
IV. Related Vulnerabilities
V. Comments for CVE-2026-75957
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