CVE-2026-110653 json
Appointment Booking Plugin <= 5.7.4 - Unauthenticated Authentication Bypass via Race Condition on OTP Attempts Counter
published 2026-10-17 23 d ago modified 2026-10-19 20 d ago also EUVD-2026-103217
- cvss
- 9.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 34%
- public exploits
- 0
- none known
Summary
The Appointment Booking Plugin – LatePoint | Calendar & Scheduling for WordPress plugin for WordPress is vulnerable to Authentication Bypass via Race Condition in all versions up to, and including, 5.7.4. This is due to a non-atomic read-modify-write on the OTP verification attempts counter in the `verifyOTP` function: the counter is incremented using a stale in-memory value with no conditional `WHERE attempts < 10` guard on the `UPDATE` and no `SELECT ... FOR UPDATE` row lock, creating a TOCTOU window that allows concurrent requests to bypass the 10-attempt lockout. This makes it possible for unauthenticated attackers — who know a target customer's registered email address or phone number — to fire concurrent requests to the `auth__verify_otp` endpoint, defeat the lockout cap, brute-force the 6-digit OTP code, and authenticate as the targeted LatePoint customer, gaining full access to their account, bookings, and personal data. The nonce check present on the endpoint (`otp_verify_otp_nonce`) does not mitigate this issue, as the nonce is publicly emitted by the unauthenticated `request_otp` and `resend_otp` endpoints and is trivially obtainable by any unauthenticated attacker prior to launching the race.
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 21 d ago
Exploit prediction
0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
Affected products
- latepoint Appointment Booking Plugin – LatePoint | Calendar & Scheduling for WordPress
Classification
- Weakness
-
- CWE-287 Improper Authentication
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/61fbc1dd-06c9-409b-8cad-3f350b38dfc3?source=cve
- plugins.trac.wordpress.org /browser/latepoint/tags/5.7.4/lib/helpers/otp_helper.php#L228
- plugins.trac.wordpress.org /browser/latepoint/tags/5.7.4/lib/helpers/otp_helper.php#L185
- plugins.trac.wordpress.org /browser/latepoint/tags/5.7.4/lib/controllers/auth_controller.php#L30
- plugins.trac.wordpress.org /browser/latepoint/tags/5.7.4/lib/controllers/auth_controller.php#L14
- plugins.trac.wordpress.org /browser/latepoint/tags/5.7.4/lib/models/model.php#L773
- plugins.trac.wordpress.org /browser/latepoint/tags/5.7.5/lib/helpers/otp_helper.php
Sources
- CVE List CVE-2026-110653
- NVD CVE-2026-110653
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