Appointment Booking Calendar <= 1.6.10.6 - Unauthenticated Arbitrary Appointment View, Modification and Deletion

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Summary

CVECVE-2026-4807
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-07 03:16:08 UTC
Updated2026-05-07 03:16:08 UTC
DescriptionThe Appointment Booking Calendar plugin for WordPress is vulnerable to Missing Authorization in versions up to and including 1.6.10.6. This is due to a flawed authorization logic in the nonce_permissions_check() method combined with the public exposure of a site-wide reusable nonce. The plugin exposes a public_nonce value through the /wp-json/ssa/v1/embed-inner endpoint, which is accessible to unauthenticated users. The appointment deletion endpoint at /wp-json/ssa/v1/appointments/{id}/delete and /wp-json/ssa/v1/appointments/bulk use a permission check that accepts requests containing both an X-WP-Nonce header (with any arbitrary value) and an X-PUBLIC-Nonce header (with the valid public nonce). When the X-WP-Nonce validation fails, the function falls back to validating the X-PUBLIC-Nonce without properly rejecting the request. Since the public_nonce is exposed to all unauthenticated visitors and is site-wide (not user-specific or appointment-specific), attackers can obtain it and use it to view details of arbitrary appointments, including the public_edit_url, or delete arbitrary appointments by ID. This makes it possible for unauthenticated attackers to view, delete or modify any appointment in the system, disclosing sensitive appointment data, causing service disruption, and loss of booking records.

Risk And Classification

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

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

Problem Types: CWE-862 | CWE-862 CWE-862 Missing Authorization

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

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Croixhaug Appointment Booking Calendar Simply Schedule Appointments Booking Plugin affected 1.6.10.6 semver Not specified

References

ReferenceSourceLinkTags
plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.9.29/booking-ap... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/changeset/3511993/simply-schedule-appointments/trunk/includes [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.9.29/includes/l... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.9.29/includes/c... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.9.29/includes/c... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.9.29/includes/c... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.9.29/includes/l... [email protected] plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/436ab843-7729-4d57-9c9e-2ede2... [email protected] www.wordfence.com
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: Athiwat Tiprasaharn (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-03-25T12:43:44.000ZVendor Notified
CNA2026-05-06T13:33:55.000ZDisclosed
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