Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin <= 1.6.12.10 - Authenticated (Contributor+) Insecure Direct Object Reference to Sensitive Information Exposure

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-13358
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-16 05:16:46 UTC
Updated2026-08-16 05:16:46 UTC
DescriptionThe Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 1.6.12.10 via the ssa_past_appointments due to missing validation on a user controlled key. This makes it possible for authenticated attackers, with contributor-level access and above, to access appointment records belonging to arbitrary users and harvest the per-appointment ownership tokens (32-character hashes) embedded in the rendered HTML, which can then be used without any authentication to read or modify those appointments including full customer PII such as name, email, phone number, and private notes. The /wp-json/ssa/v1/render-shortcode REST endpoint is registered unconditionally on rest_api_init regardless of whether the Divi theme is installed, and its permission callback only requires current_user_can('edit_posts'), meaning any Contributor-level account is sufficient to trigger this entire exploit chain.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Problem Types: CWE-639 | CWE-639 CWE-639 Authorization Bypass Through User-Controlled Key

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Croixhaug Simply Schedule Appointments affected 1.6.12.10 semver Not specified

References

ReferenceSourceLinkTags
plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.11.0/includes/c... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.11.0/includes/c... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.11.0/includes/c... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.12.4/includes/c... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.12.4/includes/c... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.12.4/includes/c... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.12.4/includes/c... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.11.0/includes/c... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.12.4/includes/c... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.11.0/includes/c... [email protected] plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/5dbe5094-d255-46b1-9e8e-9c48c... [email protected] www.wordfence.com
plugins.trac.wordpress.org/changeset [email protected] plugins.trac.wordpress.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Michael Iden (Mickhat) (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-06-25T18:33:30.000ZVendor Notified
CNA2026-08-15T15:27:24.000ZDisclosed

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