{"id":"CVE-2026-18056","summary":"HivePress Authentication \u003c= 1.1.4 - Unauthenticated Authentication Bypass via 'access_token' Parameter to Facebook Authenticator","details":"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.","modified":"2026-09-09T03:30:24.751325479Z","published":"2026-09-06T02:26:51.649Z","database_specific":{"cna_assigner":"Wordfence","cwe_ids":["CWE-287"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18056.json"},"references":[{"type":"WEB","url":"https://developers.facebook.com/docs/facebook-login/guides/advanced/manual-flow/#confirm"},{"type":"WEB","url":"https://plugins.trac.wordpress.org/browser/hivepress-authentication/tags/1.1.4/includes/components/class-facebook-authentication.php#L59"},{"type":"WEB","url":"https://plugins.trac.wordpress.org/browser/hivepress-authentication/tags/1.1.4/includes/controllers/class-authentication.php#L84"},{"type":"WEB","url":"https://plugins.trac.wordpress.org/changeset/3664231/hivepress-authentication"},{"type":"WEB","url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/c0ba6392-e6f7-479a-8b9b-9cea4b140c71?source=cve"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18056.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-18056"},{"type":"FIX","url":"https://github.com/hivepress/hivepress-authentication/commit/f97d9109002905cf57597d15c535d1155dc64657"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/hivepress/hivepress-authentication","events":[{"introduced":"0"},{"fixed":"f97d9109002905cf57597d15c535d1155dc64657"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"last_affected":"1.1.4"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-18056.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H"}]}