{"id":"CVE-2026-52839","aliases":["GHSA-w8xc-8g92-v77h"],"url":"https://o3.security/vulnerability/CVE-2026-52839","summary":"Easy!Appointments appointments/store and appointments/update allow cross-provider appointment injection — Authorization Bypass","details":"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.","published":"2026-07-14T15:21:23.199Z","modified":"2026-08-12T03:51:19.546942972Z","cvss":{"score":3.3,"severity":"LOW","vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N"},"epss":{"score":0.00229,"percentile":0.13784,"asOf":"2026-09-12"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"alextselegidis/easyappointments","fixedVersion":"1.6.0"}],"fix":{"url":"https://github.com/alextselegidis/easyappointments/commit/725eafa647308846ce887657db12771a829e42ef","label":"alextselegidis/easyappointments@725eafa"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52839.json"},{"type":"ADVISORY","url":"https://github.com/alextselegidis/easyappointments/security/advisories/GHSA-w8xc-8g92-v77h"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-52839"},{"type":"FIX","url":"https://github.com/alextselegidis/easyappointments/commit/725eafa647308846ce887657db12771a829e42ef"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:19.546942972Z"}}