CVE-2026-16540highCWE-863

CVE-2026-16540: high-severity vulnerability in Simply Schedule Appointments

Simply Schedule Appointments < 1.6.12.6 - Unauthenticated Appointment Data Disclosure and Mass Deletion via purge Endpoint

Published · Updated

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41Vexday Risk Score

No sign of exploitation. It has a public proof of concept.

ssvc Attendcvss 7.5epss 0.4%
from disclosure to weaponsame day
Published on NVDAug 2
1st PoCJul 22
The Simply Schedule Appointments WordPress plugin before 1.6.12.6 does not correctly restrict a bulk appointment operation to the requester's own records, allowing unauthenticated users to retrieve the personal data of all appointments across the site and, on premium editions, to permanently delete them.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Affected products
Unknown · Simply Schedule Appointments
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — Simply Schedule Appointments

In the same product, most dangerous first.

CVE-2026-16541MEDIUMSimply Schedule Appointments < 1.6.12.17 - Team Member+ User Email Disclosure via Users and Customers REST EndpointsEPSS 0.4%CVE-2026-15254MEDIUMSimply Schedule Appointments < 1.6.12.11 - Contributor+ Sensitive Data Disclosure via Admin ShortcodeEPSS 0.3%CVE-2026-13400MEDIUMSimply Schedule Appointments < 1.6.12.4 - Unauthenticated Stored XSS via Booking Customer InformationEPSS 0.3%