---
id: CVE-2026-93757
title: >-
  Wild Apricot Login <= 1.0.18 - Authentication Bypass via SSO Email-Collision
  Account Binding on Multisite
summary: >-
  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 …
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-287
vendor: wild-apricot
product: Wild Apricot Login
affected:
  - wild_apricot_login <= 1.0.18
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-29T10:34:17.390489Z'
published: '2026-10-29'
updated: '2026-10-29'
sourceUpdated: '2026-10-29T10:45:42.405Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-93757'
references:
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/9adbe55e-f1a1-4fa8-b28d-539d90d81c68?source=cve
  - url: >-
      https://plugins.trac.wordpress.org/browser/wild-apricot-login/tags/1.0.18/Modules/Authorization/WaLogin/Controller.php#L347
  - url: >-
      https://plugins.trac.wordpress.org/browser/wild-apricot-login/tags/1.0.18/Modules/Core/WaApi/Client.php#L22
  - url: >-
      https://plugins.trac.wordpress.org/browser/wild-apricot-login/tags/1.0.18/Modules/Core/Module.php#L159
  - url: >-
      https://plugins.trac.wordpress.org/browser/wild-apricot-login/tags/1.0.18/Modules/Synchronization/UserSynchronizer.php#L36
  - url: >-
      https://plugins.trac.wordpress.org/browser/wild-apricot-login/tags/1.0.18/Modules/Core/Module.php#L112
tags:
  - cve.org
epss: 0.00425
epssPercentile: 0.37005
ingestedAt: '2026-10-31T05:18:25.268Z'
---

## Overview

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.

## Affected

- `wild_apricot_login <= 1.0.18`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.