Risk Letters

Exploited vulnerability

CVE-2026-57812

TLP:CLEAR

Missing Authorization

Missing Authorization vulnerability in NSquared Simply Schedule Appointments simply-schedule-appointments allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Simply Schedule Appointments: from n/a through <= 1.6.12.4.

Facts

  • Vendor: NSquared
  • Product: Simply Schedule Appointments
  • EPSS (probability of exploitation within 30 days): 0.3 %
  • First known exploitation: 13 October 2026
  • First seen by Risk Letters: 13 October 2026

Members see which Nordic sectors the flaw hits, and what to do about it.

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD