{"id":"CVE-2026-104732","published":"2026-10-10T04:18:08.493","lastModified":"2026-10-13T13:30:21.620","description":"The Advanced IP Blocker plugin for WordPress is vulnerable to Authentication Bypass in all versions up to, and including, 8.13.13 The vulnerability exists because `handle_login_action()` performs no server-side check — via transient, session marker, or equivalent — that a requester completed step-1 password authentication before processing a step-2 TOTP submission for the POSTed `user_id`; compounding this, an error branch in the function unconditionally mints a fresh `advaipbl-2fa-interim-{user_id}` nonce and delivers it in a `Location` header to any unauthenticated caller, after which `display_2fa_login_form_step_2()` renders a valid `advaipbl-2fa-verify-{user_id}` nonce in HTML — both nonces computed against a fixed `uid=0` empty-session context and therefore fully reusable by the attacker across subsequent requests. This makes it possible for unauthenticated attackers to bypass authentication entirely for any 2FA-enabled account, including administrators, by brute-forcing an unthrottled 6-digit TOTP code (no attempt counter, no account lockout, and no `wp_login_failed` firing) and receiving a fully authenticated session cookie via `wp_set_auth_cookie` without ever supplying the account password, resulting in complete site takeover. Exploitation requires only a known `user_id` for an account that has the plugin's 2FA feature enabled.","cvssScore":9.8,"cvssSeverity":"CRITICAL","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwes":["CWE-287"],"vendors":[],"products":[],"references":[{"url":"https://plugins.trac.wordpress.org/browser/advanced-ip-blocker/tags/8.13.13/includes/class-advaipbl-2fa-manager.php#L71","tags":[]},{"url":"https://plugins.trac.wordpress.org/browser/advanced-ip-blocker/tags/8.13.13/includes/class-advaipbl-main.php#L519","tags":[]},{"url":"https://plugins.trac.wordpress.org/browser/advanced-ip-blocker/tags/8.13.13/includes/class-advaipbl-main.php#L6875","tags":[]},{"url":"https://plugins.trac.wordpress.org/browser/advanced-ip-blocker/tags/8.13.13/includes/class-advaipbl-main.php#L6912","tags":[]},{"url":"https://plugins.trac.wordpress.org/browser/advanced-ip-blocker/tags/8.13.13/includes/class-advaipbl-main.php#L7022","tags":[]},{"url":"https://plugins.trac.wordpress.org/changeset/3725139/advanced-ip-blocker/trunk/includes/class-advaipbl-main.php","tags":[]},{"url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/d080845b-6814-4b10-a3ab-1f5aa1d09132?source=cve","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"The Advanced IP Blocker WordPress plugin has a critical authentication bypass vulnerability where attackers can bypass 2FA entirely by reusing fixed nonces and brute-forcing TOTP codes without any account lockout or throttling mechanisms.","exploitability":"Very easy to exploit with only a known user ID for an account with 2FA enabled, requiring no additional credentials or complex setup.","blast_radius":"Full site takeover is possible as attackers can gain authenticated access to any 2FA-enabled account including administrators without ever submitting a password.","remediation":"Upgrade to version 8.13.14 or later which fixes the authentication bypass vulnerability in the Advanced IP Blocker plugin.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["auth-bypass","wp-plugin","2fa","critical"],"model":"garnet-coder","analyzedAt":"2026-10-12T08:43:58.607Z"}}