Vulnerability · Published Jul 14, 2026 · Assigned by GitHub_M
CVE-2026-52839Easy!Appointments appointments/store and appointments/update allow cross-provider appointment injection — Authorization Bypass
Low 3.3
In plain English
A low-severity authorization bypass via user-controlled key in easyappointments from alextselegidis. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Packagist | alextselegidis/easyappointments | 1.6.0 | GHSA-w8xc-8g92-v77h |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| alextselegidis | easyappointments | < 1.6.0 |
Weakness: CWE-639, CWE-862 · Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N