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Vulnerabilities

Vulnerability · CVE-2026-110653

Appointment Booking Plugin <= 5.7.4 - Unauthenticated Authentication Bypass via Race Condition on OTP Attempts Counter

Published Oct 16, 2026 · catalog updated Oct 18, 2026 · Appointment Booking Plugin – LatePoint | Calendar & Scheduling for WordPress

Check if you run it

No confirmed exploitation is on record for CVE-2026-110653. EPSS is 0.40%. Act only if a listed version of Appointment Booking Plugin – LatePoint | Calendar & Scheduling for WordPress is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.40%
Remediation
Version ranges on file
Affected products
stated Appointment Booking Plugin – LatePoint | Calendar & Scheduling for WordPress · vendor latepoint Appointment Booking Plugin – LatePoint | Calendar & Scheduling for WordPress · wordpress latepoint

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 function: the counter is incremented using a stale in-memory value with no conditional guard on the and no 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 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 ( ) does not mitigate this issue, as the nonce is publicly emitted by the unauthenticated and endpoints and is trivially obtainable by any unauthenticated attacker prior to launching the race.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • stated Appointment Booking Plugin – LatePoint | Calendar & Scheduling for WordPress<= 5.7.4
  • vendor latepoint Appointment Booking Plugin – LatePoint | Calendar & Scheduling for WordPressversion unspecified
  • wordpress latepointversion unspecified

How to fix CVE-2026-110653

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-110653. EPSS is 0.40%. Act only if a listed version of Appointment Booking Plugin – LatePoint | Calendar & Scheduling for WordPress is installed.

Which versions are affected?

Compare what you have installed with Appointment Booking Plugin – LatePoint | Calendar & Scheduling for WordPress <= 5.7.4. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-287: Improper Authentication. EPSS 0.40%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

WordPress security

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 16, 2026 · Wordfence Intelligence

    Detected

    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 function: the counter is incremented using a stale in-memory value with no conditional guard on the a

  2. Oct 17, 2026 · CVE.org

    Updated

    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 function: the counter is incremented using a stale in-memory value with no conditional guard on the a

  3. Oct 17, 2026 · NIST NVD

    Updated

    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 function: the counter is incremented using a stale in-memory value with no conditional guard on the a

  4. Oct 18, 2026 · NIST NVD

    Updated

    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 function: the counter is incremented using a stale in-memory value with no conditional guard on the a

Sources

  • CVE.orgVulnerability recordCVE-2026-110653

    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 attem

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-110653

    30-day exploitation probability 0.4%

    first.org
  • NIST NVDVulnerability recordCVE-2026-110653

    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 attem

    nvd.nist.gov
  • Tenable CVE DatabaseVulnerability recordCVE-2026-110653

    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 function: the counter is incremented using a stale in-memory value with no conditional guard on the a

    tenable.com
  • Wordfence IntelligencePackage advisoryCVE-2026-110653

    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 attem

    wordfence.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.