{"schemaVersion":3,"id":"CVE-2026-52839","aliases":[],"status":"published","duplicateOf":null,"title":null,"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.","dates":{"published":"2026-07-14T15:21:23.199Z","modified":"2026-07-29T16:25:59.689Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":3.3,"severity":"low","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","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","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","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","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00229,"percentile":0.12869,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.00229},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00229,"percentile":0.12869}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00229,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00229,"percentile":0.12869}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-639","name":"Authorization Bypass Through User-Controlled Key","description":"The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/639.html"},{"id":"CWE-862","name":"Missing Authorization","description":"The product does not perform an authorization check when an actor attempts to access a resource or perform an action.","type":"weakness","status":"Incomplete","abstraction":"Class","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/862.html"}],"affected":[{"vendor":"alextselegidis","product":"easyappointments","name":"easyappointments","label":"easyappointments","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 1.6.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1.6.0","eol":null,"hubHref":"/vendor/alextselegidis/easyappointments"}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/alextselegidis/easyappointments/security/advisories/GHSA-w8xc-8g92-v77h","label":"github.com/alextselegidis/easyappointments/security/advisories/GHSA-w8xc-8g92-v77h","hostname":"github.com","tags":["X Refsource CONFIRM"]},{"url":"https://github.com/alextselegidis/easyappointments/commit/725eafa647308846ce887657db12771a829e42ef","label":"github.com/alextselegidis/easyappointments/commit/725eafa647308846ce887657db12771a829e42ef","hostname":"github.com","tags":["X Refsource MISC"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-07-14T15:21:23.199Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-07-29T16:25:59.689Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":13,"level":"low","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T04:34:05.553Z","stale":false,"partial":false}}