alextselegidis Easy Appointments up to 1.5.x Provider Scope Validation appointments/store id_users_provider improper authorization

Summaryinfo

A vulnerability labeled as critical has been found in alextselegidis Easy Appointments up to 1.5.x. Affected by this issue is some unknown functionality of the file appointments/store of the component Provider Scope Validation. Executing a manipulation of the argument id_users_provider can lead to improper authorization. This vulnerability is handled as CVE-2026-52839. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability has been found in alextselegidis Easy Appointments up to 1.5.x and classified as critical. This vulnerability affects an unknown part of the file appointments/store of the component Provider Scope Validation. The manipulation of the argument id_users_provider with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Easy!Appointments is a self hosted appointment scheduler. Versions prior to 1.6.0 correctly filter provider-scoped appointments in the `appointments/search` response, proving that provider isolation is an intended security boundary. However, the direct mutation endpoints `appointments/store` and `appointments/update` only check generic appointment privileges and never verify that the submitted `id_users_provider` belongs to the current session. A normal authenticated provider can inject new appointments into another provider's schedule via `store`, or reassign existing appointments into a foreign provider's calendar via `update`. The `store` path contains an additional write-before-crash bug: the unauthorized row is committed to the database before the controller crashes on a type error, so the attacker receives an error response while the foreign appointment is already persisted. Version 1.6.0 patches the issue.

The advisory is available at github.com. This vulnerability was named CVE-2026-52839 since 06/08/2026. The exploitation appears to be easy. The attack can be initiated remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1548.002 by the MITRE ATT&CK project.

Upgrading to version 1.6.0 eliminates this vulnerability.

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Productinfo

Type

• Appointment Software

Vendor

• alextselegidis

Name

• Easy Appointments

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5

CPE 2.3info

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CPE 2.2info

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