CVE-2026-52839

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.

CVSS 3.1

3.3CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N

EPSS

0.2% chance of exploitation in the next 30 days; higher than 7% of CVEs (scores of 2026-10-25)

CWEs

CWE-639, CWE-862

Published

2026-07-14

Modified

2026-10-24

Record from

the NVD, synced 2026-10-25

References

• https://github.com/alextselegidis/easyappointments/commit/725eafa647308846ce887657db12771a829e42ef
• https://github.com/alextselegidis/easyappointments/security/advisories/GHSA-w8xc-8g92-v77h
• https://github.com/alextselegidis/easyappointments/security/advisories/GHSA-w8xc-8g92-v77h

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