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CVE-2026-93757— Wild Apricot Login <= 1.0.18 - Authentication Bypass via SSO Email-Collision Account Binding on Multisite

Quick assessment

Affected
wild-apricot Wild Apricot Login
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 的 Wild Apricot Login 插件在所有 1.0.18 及更早版本中，存在通过 SSO（单点登录）邮箱碰撞导致的账户绑定认证绕过漏洞。当插件未找到与 incoming SSO 登录请求对应的 WildApricot 联系人 ID 映射时，会在 中回退到使用网络全局范围的 函数来查找 WordPress 用户；随后， 会将该用户与 WildApricot 联系人绑定，并由 通过 为该用户签发会话 Cookie。整个流程仅受 检查保护，却从未要求提供对匹配 WordPress 账户所有权

CVSS 7.5 · High
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I. Basic Information for CVE-2026-93757

Vulnerability Information
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Vulnerability Title
Wild Apricot Login <= 1.0.18 - Authentication Bypass via SSO Email-Collision Account Binding on Multisite
Source: CVE Program / CVE List V5
Vulnerability Description
The Wild Apricot Login plugin for WordPress is vulnerable to Authentication Bypass via SSO Email-Collision Account Binding in all versions up to, and including, 1.0.18. When no WildApricot contact-ID mapping is found for an incoming SSO login, the plugin falls back to a network-global `get_user_by('email', ...)` lookup in `Module.php` to resolve a WordPress user, then `UserSynchronizer::syncWaContact()` binds and `Controller::login()` issues a session cookie via `wp_set_auth_cookie()` for that resolved user — both guarded only by `is_super_admin()` — without ever requiring proof of ownership of the matched WordPress account such as a password, local account-linking confirmation, inbox verification, or administrator approval. This makes it possible for attackers with custom-level WildApricot membership access to authenticate as an existing WordPress subsite administrator on a path-based Multisite network, obtaining a valid network-global authentication cookie for the victim without their credentials. Exploitation requires that the attacker control a WildApricot contact whose email address matches the target WordPress administrator's email — achievable via a public zero-fee membership application on the connected WildApricot organization — and that they complete the SSO flow on any subsite where Wild Apricot Login is active; because WordPress user identities and authentication cookies are network-global, the cookie issued on that subsite is equally valid on any other subsite where the victim user holds an administrator role.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
wild-apricot Wild Apricot Login 0 ~ 1.0.18 -

II. Public POCs for CVE-2026-93757

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III. Intelligence Information for CVE-2026-93757

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Other References for CVE-2026-93757 (6)

IV. Related Vulnerabilities

Same weakness: CWE-287