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CVE-2026-104732— Advanced IP Blocker <= 8.13.13 - Unauthenticated Authentication Bypass via Missing Step-1 Binding to 2FA Login Handler

Quick assessment

Affected
inilerm Advanced IP Blocker
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 的 Advanced IP Blocker 插件在 8.13.13 及更早版本中存在身份验证绕过漏洞。该漏洞的成因在于 函数在处理 POST 请求中携带的 以进行第二步的 TOTP（一次性密码）验证时，未通过临时数据（transient）、会话标记或类似机制在服务端检查请求者是否已成功完成第一步的密码认证。 此外，该函数中的一个错误分支会无条件地生成一个新的 非ce（nonce），并通过 响应头将其发送给任何未认证的调用者。随后， 函数会在 HTML 中渲染一个有效的 nonce。这些 nonc

CVSS 9.8 · Critical
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I. Basic Information for CVE-2026-104732

Vulnerability Information
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Vulnerability Title
Advanced IP Blocker <= 8.13.13 - Unauthenticated Authentication Bypass via Missing Step-1 Binding to 2FA Login Handler
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
inilerm Advanced IP Blocker 0 ~ 8.13.13 -

II. Public POCs for CVE-2026-104732

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III. Intelligence Information for CVE-2026-104732

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Other References for CVE-2026-104732 (7)

IV. Related Vulnerabilities

Same product: Advanced IP Blocker
Same vendor: inilerm
Same weakness: CWE-287

V. Comments for CVE-2026-104732

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