# Simply Schedule Appointments <= 1.6.12.35 - Authenticated (Contributor+) Insecure Direct Object Reference via 'edit' Shortcode Attribute

- **ID:** WPSEC-2026-1013
- **Plugin:** Simply Schedule Appointments (`simply-schedule-appointments`), https://wordpress.org/plugins/simply-schedule-appointments/
- **Affected versions:** all versions before 1.6.12.37
- **Fixed in:** 1.6.12.37 (Update to 1.6.12.37 or later.)
- **Severity:** Medium 6.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L)
- **Weakness:** CWE-639
- **Usage among sites WPSec scans:** plugin Medium, affected versions Medium (as of 2026-10-15)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/simply-schedule-appointments
- **Fix released:** 2026-10-14
- **Published:** 2026-10-15
- **URL:** https://wpsec.com/vuln/WPSEC-2026-1013/

## Description

The Simply Schedule Appointments plugin for WordPress is vulnerable to Insecure Direct Object Reference via the 'edit' attribute of the [ssa_booking] shortcode in all versions up to, and including, 1.6.12.35, due to the shortcode generating a valid access token for any supplied appointment ID without checking that the current user may access that appointment. This makes it possible for authenticated attackers, with contributor-level access and above, to obtain access tokens for arbitrary appointments and use them to view, modify, or delete those appointments, including the customers' personal information.

## References

- https://wpsec.com/vuln/WPSEC-2026-1013/
- https://plugins.svn.wordpress.org/simply-schedule-appointments/tags/1.6.12.37/
- https://wordpress.org/plugins/simply-schedule-appointments/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-1013/

License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Free to use, share and adapt, also commercially, if you credit WPSec and link to this advisory.