What’s Vulnerable › Vulnerabilities

CVE-2026-52839: Easy!Appointments appointments/store and appointments/update allow cross-provider appointment injection — Authorization Bypass

• Severity: low (CVSS 3.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-14 · updated 2026-10-24
• Weakness: CWE-639

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 products

• alextselegidis/easyappointments: before 1.6.0

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

Get alerted when CVE-2026-52839 or the next vulnerability affects your stack