What is CVE-2023-50851?

CVE-2023-50851 is a high-severity vulnerability in Nsqua Simply Schedule Appointments, classified under SQL Injection. CVSS score: 7.6/10. Published 2023-12-28.

How severe is CVE-2023-50851?

High severity. CVSS v3 base score is 7.6 out of 10.

Is CVE-2023-50851 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

SQL Injection in Nsqua Simply Schedule Appointments

CVE-2023-50851

Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in N Squared Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin.This issue affects Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin: from n/a before 1.6.6.1.

Vulnerability class: SQL Injection

Published 2023-12-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:L.

EPSS exploit prediction

EPSS: 0.005 (42.6th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 42.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: -0.000

Affected products

Weakness classification (CWE)

CWE-89 — SQL Injection

Public proof-of-concept exploits

References

patchstack.com/database/vulnerability/simply-schedule-appointments/wordpress-si… (Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2023-50851?: CVE-2023-50851 is a high-severity vulnerability in Nsqua Simply Schedule Appointments, classified under SQL Injection. CVSS score: 7.6/10. Published 2023-12-28.
How severe is CVE-2023-50851?: High severity. CVSS v3 base score is 7.6 out of 10.
Is CVE-2023-50851 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.