CVE-2026-59523: WordPress Simply Schedule Appointments plugin <= 1.6.11.11 - Broken Access Control vulnerability

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-13 · updated 2026-10-24
Weakness: CWE-862

Description

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 1.6.11.11.

Affected products

croixhaug Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin: through 1.6.11.11

References

https://patchstack.com/database/wordpress/plugin/simply-schedule-appointments/vulnerability/wordpress-simply-schedule-appointments-plugin-1-6-11-11-broken-access-control-vulnerability?_s_id=cve

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