{"id":"CVE-2026-48075","summary":"OpenReception's unauthenticated add-to-tunnel endpoint accepts arbitrary appointment injections","details":"OpenReception's appointment booking software provides an end-to-end encrypted appointment booking platform. Prior to version 1.0.5, the `add-to-tunnel` endpoint creates a new appointment row in any client tunnel without any caller authentication. A request that supplies any valid `tunnelId` and any valid `emailHash` (the two need not belong to the same tunnel) results in an inserted appointment with `status = \"CONFIRMED\"`, attacker-controlled ciphertext fields, attacker-controlled date and duration, and an attacker-chosen agent. The endpoint validates only that some tunnel exists with the given `emailHash`, then writes the appointment using the attacker-supplied `tunnelId` directly. The `emailHash` lookup is effectively an existence check on the tenant; it does not authenticate the caller as the owner of the supplied `tunnelId`. Combined with the absence of any session, Authorization header, booking access token, or PoW, this makes the endpoint accept arbitrary appointment writes into arbitrary tunnels. By contrast, the sibling endpoint `create-new-client` (used to bootstrap a brand-new client tunnel) requires a Bearer bootstrap booking access token issued by the bootstrap-challenge / bootstrap-verify flow. The `add-to-tunnel` endpoint, intended for return-clients booking additional appointments, has no equivalent gate. The application's own middleware confirms this is intentional: `add-to-tunnel` is explicitly listed in the apiAuthHandle public-route allowlist alongside the bootstrap and challenge endpoints (which legitimately have no session). Version 1.0.5 fixes the issue.","aliases":["GHSA-rhp5-vmcx-4qm8"],"modified":"2026-08-09T03:30:33.123590620Z","published":"2026-08-06T20:39:34.056Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-862"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48075.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48075.json"},{"type":"ADVISORY","url":"https://github.com/open-reception/appointment-booking-software/security/advisories/GHSA-rhp5-vmcx-4qm8"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-48075"},{"type":"FIX","url":"https://github.com/open-reception/appointment-booking-software/commit/4522a44c001782848faff5529d7c1e2be7ac9ef5"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/open-reception/appointment-booking-software","events":[{"introduced":"0"},{"fixed":"4522a44c001782848faff5529d7c1e2be7ac9ef5"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"1.0.5"}]}}],"versions":["v1.0.4","v1.0.2","v1.0.1","v1.0.0","v1.0.0-rc2","v1.0.0-rc"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-48075.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L"}]}