{"schema":"threatline.record/2","record":{"id":"CVE-2026-75520","aliases":["GHSA-8rv5-x8wv-c5c4"],"summary":"Domoticz: Missing authorization and path traversal in the udevices Lua parser handler","details":"Domoticz is a free, open source home automation system for Linux, Windows, macOS, and Raspberry Pi. Prior to 2026.3, the `udevices` JSON command handler, `Cmd_UpdateDevices` in `main/WebServerCmds.cpp`, performed no `session.rights` check before invoking a Lua parser script, while its sibling command handlers gate access by role. A low-privilege authenticated user could trigger execution of an existing operator-installed Lua parser script with attacker-controlled input through the `GET /json.htm` endpoint with `type=command` and `param=udevices`. The `script` parameter also lacked a `..` path-traversal guard: `CLuaHandler::executeLuaScript` in `main/LuaHandler.cpp` constructed the filename from the parser directory and the supplied script name before passing it to `luaL_loadfile`. Execution is limited to already-installed valid Lua files; this is not arbitrary code execution, and the advisory states that file-write and upload paths require administrator privileges. This issue is addressed in version 2026.3.","categories":["Unclassified"],"product":"domoticz","vendor":"domoticz","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-75520","source_modified_at":"2026-10-28T22:30:59.693Z","fetched_at":"2026-10-29T00:48:09.584895Z","product":"domoticz","vendor":"domoticz","versions":[{"version":"<= 2026.2","status":"affected"}],"defaultStatus":null}],"fixed_versions":[],"cvss":5.4,"severity":"Medium","kev":{"listed":false},"epss":{"probability":null,"percentile":null,"score_date":null},"published_at":"2026-10-28T22:30:59.693Z","modified_at":"2026-10-28T22:30:59.693Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-75520","fetched_at":"2026-10-29T00:48:09.584895Z","source_modified_at":"2026-10-28T22:30:59.693Z"}],"sources":["CVE List"],"references":[{"source":"CVE List","url":"https://github.com/domoticz/domoticz/security/advisories/GHSA-8rv5-x8wv-c5c4","tags":["x_refsource_CONFIRM"]},{"source":"CVE List","url":"https://github.com/domoticz/domoticz/commit/73ed0495af6de3309f27cfc0091e803300ab5ccd","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/domoticz/domoticz/blob/2026.3/main/WebServerCmds.cpp#L3445-L3451","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/domoticz/domoticz/releases/tag/2026.3","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/domoticz/libwebem/blob/dfe946fa32f4c211662e47ef55b8cedfc50a6a76/include/libwebem/session.h#L10-L17","tags":["x_refsource_MISC"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-28T22:30:59.693Z","content_hash":"b4620102ecddb58745b003324ac682ac540b0beba2c189b0651c9c0610f6ecbb"}}