OTP Login & Register Woocommerce <= 2.7.2 - Unauthenticated Authentication Bypass via Brute Force
The OTP Login & Register Woocommerce plugin for WordPress is vulnerable to Authentication Bypass via OTP Brute Force in all versions up to, and including, 2.7.2. The vulnerability exists because the OTP rate-limit attempt counter in process_otp_form is keyed exclusively on the attacker-controlled xoo_ml_user_ip_data cookie's ip_address field, allowing unlimited counter resets by simply rotating the cookie, while the OTP itself is generated with PHP's non-cryptographic rand() function over a default space of only 9,000 possible values (1000–9999), and both the OTP issuance endpoint (xoo_ml_login_with_otp) and verification endpoint (xoo_ml_otp_form_submit) are registered as unauthenticated wp_ajax_nopriv actions with no nonce or capability checks. This makes it possible for unauthenticated attackers to brute-force the OTP for any registered account and obtain a full WordPress authentication session — including for administrator accounts — via wp_set_auth_cookie() in login_user_with_otp(). Exploitation requires the attacker to know the target user's registered phone number, which is used to trigger OTP issuance via the unauthenticated xoo_ml_login_with_otp endpoint.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| WordPress plugin | OTP Login & Register Woocommerce | <= 2.7.2 | 2.7.3 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N- Weakness (CWE)
CWE-434- Platform
- WordPress
- Package
OTP Login & Register Woocommerce- Disclosed
- 10.09.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
Wordfence Intelligence - 4bd4b379-6d7d-4cfe-bb16-a931c5d68d02 - Wordfence Intelligence
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Copyright 2012-2026 Defiant Inc.
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Vulnerability history: OTP Login & Register Woocommerce
All published vulnerabilities of this package (WordPress plugin), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 5
- First → latest
- 05.2022 09.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 2
- Medium 3
Disclosures per year
- 2022: 1
- 2023: 1
- 2024: 1
- 2025: 0
- 2026: 2
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OTP Login & Register Woocommerce <= 2.7.2 - Unauthenticated Authentication Bypass via Brute Force this entry
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