Auth bypass in Simply Schedule Appointments
CVE-2026-16540
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.
Vulnerability class: Broken Access Control
EPSS: 0.004 (35.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: 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 — versions 0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- contact@wpscan.com (technical-description, exploit, vdb-entry)
Frequently asked questions
- What is CVE-2026-16540?
- CVE-2026-16540 is a high-severity vulnerability in Simply Schedule Appointments, classified under Incorrect Authorization. CVSS score: 7.5/10. Published 2026-08-02.
- How severe is CVE-2026-16540?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2026-16540 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.