CVE-2026-39447 — Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin [simply-schedule-appointments] < 1.6.11.0

CVE	Vulnerability	Type	Severity	Affected	Fixed in	Published	Status
CVE-2026-39447	Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin [simply-schedule-appointments] < 1.6.11.0	Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')	High 7.1	< 1.6.11.0	1.6.11.0	2026-05-28	—

CVE-2026-39447

The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 1.6.10.6 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Source: Wordfence

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