HivePress Authentication <= 1.1.4 - Unauthenticated Authentication Bypass via 'access_token' Parameter to Facebook Authenticator
| CVE | CVE-2026-18056 |
|---|---|
| CVSS | 7.5 (High) |
| Publicly Published | September 5, 2026 |
| Last Updated | September 6, 2026 |
| Researcher |
Mutantgun
|
Description
The HivePress Authentication plugin for WordPress is vulnerable to Authentication Bypass via the access_token parameter in all versions up to, and including, 1.1.4. This is due to the authenticate_user function's Facebook authenticator resolving third-party identity by forwarding the attacker-supplied access_token to the Facebook Graph API and trusting the returned email and ID verbatim, without performing any application ID or audience validation — specifically, no /debug_token verification and no comparison of the token's app_id against the configured hp_facebook_app_id. This makes it possible for unauthenticated attackers to authenticate as any existing WordPress user, including administrators, whose email address is associated with a Facebook account for which the attacker can obtain any valid access token. Important Note: To exploit the vulnerability, the attacker must obtain the victim's access token.
Learn more about Authentication Bypass vulnerabilities and how to prevent them.
References
- developers.facebook.com
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- github.com
- plugins.trac.wordpress.org
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Vulnerability Details for HivePress Authentication
| Software Type | Plugin |
|---|---|
| Software Slug | hivepress-authentication (view on wordpress.org) |
| Patched? | Yes |
| Remediation | Update to version 1.1.5, or a newer patched version |
| Affected Version |
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| Patched Version |
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