HivePress Authentication Plugin up to 1.1.4 on WordPress Facebook Authenticator authenticate_user access_token improper authentication

Summaryinfo

A vulnerability was found in HivePress Authentication Plugin up to 1.1.4. It has been declared as critical. This issue affects the function authenticate_user of the component Facebook Authenticator. Executing a manipulation of the argument access_token can lead to improper authentication. This vulnerability is registered as CVE-2026-18056. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability has been found in HivePress Authentication Plugin up to 1.1.4 and classified as critical. This vulnerability affects the function authenticate_user of the component Facebook Authenticator. The manipulation of the argument access_token with an unknown input leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at wordfence.com. This vulnerability was named CVE-2026-18056 since 07/28/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/06/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-72043). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• WordPress Plugin

Name

• HivePress Authentication Plugin

Version

• 1.1.0
• 1.1.1
• 1.1.2
• 1.1.3
• 1.1.4

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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