{"id":"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.","aliases":["GHSA-w8xc-8g92-v77h"],"modified":"2026-07-17T03:42:00.222639628Z","published":"2026-07-14T15:21:23.199Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52839.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-639","CWE-862"]},"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/4abb10545d83ac1a57d03f6502376ee67696ea7c"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/alextselegidis/easyappointments","events":[{"introduced":"0"},{"fixed":"4abb10545d83ac1a57d03f6502376ee67696ea7c"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"1.6.0"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["1.6.0-beta.2","1.6.0-beta.1","1.6.0-alpha.1","1.5.2-beta.1","1.5.1","1.5.1-beta.1","1.5.0","1.5.0-beta.1","1.5.0-alpha.1","1.5.0-dev.4","1.5.0-dev.3","1.5.0-dev.2","1.5.0-dev.1","1.3.0-beta.2","1.3.0-beta.1","1.3.0-alpha.1","1.2.0-beta.1","1.2.0-alpha.1","1.1.0","1.1.0-beta.2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52839.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N"}]}