Disclosure summary
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-reported weakness categories
CWE-287
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
CVEProject/cvelistV5 releases · RSS-2b11a7e1dade072c26c14342ed52b8ffeb8
Open original source · Updated Oct 10, 2026
CVE 2026-10-10_2300Z
CVE mention in publisher metadata; check the original affected versions.
CVEProject/cvelistV5 releases · RSS-f946067cb6a34653c12f3a7d3e105773b0f
Open original source · Updated Oct 10, 2026
CVE 2026-10-10_2200Z
CVE mention in publisher metadata; check the original affected versions.
CVEProject/cvelistV5 releases · RSS-7c1aa4e02ee105026a9d5ef835739da2231
Open original source · Updated Oct 10, 2026
CVE 2026-10-10_2100Z
CVE mention in publisher metadata; check the original affected versions.
CVEProject/cvelistV5 releases · RSS-5daad76275e9590636f1bfed69854f874d0
Open original source · Updated Oct 10, 2026
CVE 2026-10-10_2000Z
CVE mention in publisher metadata; check the original affected versions.
CVEProject/cvelistV5 releases · RSS-f5a41e504aba4034d4f99f9de25577fb6a1
Open original source · Updated Oct 10, 2026
CVE 2026-10-10_1900Z
CVE mention in publisher metadata; check the original affected versions.
CVEProject/cvelistV5 releases · RSS-f5dee9e139662097b84b17b3e74d5544c25
Open original source · Updated Oct 10, 2026
CVE 2026-10-10_1800Z
CVE mention in publisher metadata; check the original affected versions.
CVEProject/cvelistV5 releases · RSS-6729502a4ea3125ddd379f75d3eb8cb63a6
Open original source · Updated Oct 10, 2026
CVE 2026-10-10_1700Z
CVE mention in publisher metadata; check the original affected versions.
CVEProject/cvelistV5 releases · RSS-a10ecc85ff20aad80a7e8436dd92befdcfc
Open original source · Updated Oct 10, 2026
CVE 2026-10-10_1600Z
CVE mention in publisher metadata; check the original affected versions.
CVEProject/cvelistV5 releases · RSS-5f26de48c2d7605f54c0980f1221b67644b
Open original source · Updated Oct 10, 2026
CVE 2026-10-10_1500Z
CVE mention in publisher metadata; check the original affected versions.
CVEProject/cvelistV5 releases · RSS-95eb7d8256449b8a75dc66291b65bfe37a2
Open original source · Updated Oct 10, 2026
CVE 2026-10-10_1400Z
CVE mention in publisher metadata; check the original affected versions.
NIST National Vulnerability Database · NVD-CVE-2026-104732
Open original source · Updated Oct 10, 2026
Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.
Original records & references
- NIST NVD record
- CVE Program record
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- www.wordfence.com
PUBLISHED 2026-10-10T00:18:08-04:00
MODIFIED 2026-10-10T00:18:08-04:00
INGESTED 2026-10-10T20:55:12-04:00