Risk Letters

Exploited vulnerability

CVE-2026-39447

TLP:CLEAR

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Unauthenticated Cross Site Scripting (XSS) in Simply Schedule Appointments <= 1.6.10.6 versions.

Facts

  • Vendor: NSquared
  • Product: Simply Schedule Appointments
  • EPSS (probability of exploitation within 30 days): 0.2 %
  • 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.

Get the full brief

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