CVE-2026-110653
Appointment Booking Plugin <= 5.7.4 - Unauthenticated Authentication Bypass via Race Condition on OTP Attempts Counter
- Published
- Updated
- Reserved
- Assigned by
- Wordfence
Description
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| WordfenceCNA (assigner) | 3.1 | Critical9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
| NVDNVD · Deferred | 3.1 | Critical9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
- EPSS (exploitation in 30 days)
- 0.40% · top 65% of all CVEs (5 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.1.
Weakness
Affected products
References (7)
- https://www.wordfence.com/threat-intel/vulnerabilities/id/61fbc1dd-06c9-409b-8cad-3f350b38dfc3?source=cve (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/latepoint/tags/5.7.4/lib/helpers/otp_helper.php#L228 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/latepoint/tags/5.7.4/lib/helpers/otp_helper.php#L185 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/latepoint/tags/5.7.4/lib/controllers/auth_controller.php#L30 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/latepoint/tags/5.7.4/lib/controllers/auth_controller.php#L14 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/latepoint/tags/5.7.4/lib/models/model.php#L773 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/latepoint/tags/5.7.5/lib/helpers/otp_helper.php (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-110653)Record last updated .