CVE-2026-93757
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk37th percentile - higher than 37% of all known CVEs
Summary
The Wild Apricot Login plugin for WordPress in versions up to and including 1.0.18 is vulnerable to authentication bypass via SSO email-collision account binding. When no WildApricot contact-ID mapping is found, the plugin falls back to a network-global email lookup and issues a session cookie for the resolved user without requiring proof of account ownership (password, email verification, or admin approval). An attacker with a WildApricot contact whose email matches a WordPress subsite administrator's email can authenticate as that administrator across the Multisite network.
Risk Assessment
An attacker can obtain a valid network-global authentication cookie for an existing WordPress Multisite subsite administrator, leading to full compromise of that subsite and potentially other subsites where the victim has administrator rights. This only requires a public zero-fee WildApricot membership application using the victim's email address.
Recommendation
Update the Wild Apricot Login plugin to a version newer than 1.0.18 if available, or disable it until a patch is released. Additionally, consider restricting public WildApricot membership registration and verifying member email addresses.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS