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

Summary

CVE	CVE-2026-93757
State	PUBLISHED
Assigner	Wordfence
Source Priority	CVE Program / NVD first with legacy fallback
Published	2026-10-29 04:18:43 UTC
Updated	2026-10-29 04:18:43 UTC
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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-287 | CWE-287 CWE-287 Improper Authentication

Version	Source	Type	Score	Severity	Vector
3.1	[email protected]	Primary	7.5	HIGH	`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H`
3.1	CNA	DECLARED	7.5	HIGH	`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H`

CVSS v3.1 Breakdown

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

Source	Vendor	Product	Version	Platforms
CNA	Wild-apricot	Wild Apricot Login	affected 1.0.18 semver	Not specified

References

Reference	Source	Link	Tags
www.wordfence.com/threat-intel/vulnerabilities/id/9adbe55e-f1a1-4fa8-b28d-539d9...	[email protected]	www.wordfence.com
plugins.trac.wordpress.org/browser/wild-apricot-login/tags/1.0.18/Modules/Core/Module.php	[email protected]	plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/wild-apricot-login/tags/1.0.18/Modules/Core/Module.php	[email protected]	plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/wild-apricot-login/tags/1.0.18/Modules/Synchronizatio...	[email protected]	plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/wild-apricot-login/tags/1.0.18/Modules/Authorization/...	[email protected]	plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/wild-apricot-login/tags/1.0.18/Modules/Core/WaApi/Cli...	[email protected]	plugins.trac.wordpress.org
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: zickzick2 (en)

Additional Advisory Data

Source	Time	Event
CNA	2026-10-28T14:44:24.000Z	Disclosed

There are currently no legacy QID mappings associated with this CVE.