{"affected":[{"product":"domoticz","source":"CNA: GitHub_M","vendor":"domoticz","versions":[{"status":"affected","version":"<= 2026.2"}]}],"cveId":"CVE-2026-75520","cwes":["CWE-22","CWE-862"],"description":"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.","epss":{"date":"2026-11-02","percentile":0.20401,"score":0.00279},"exploits":[],"kev":null,"metrics":[{"score":5.4,"severity":"medium","source":"CNA: GitHub_M","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","version":"3.1"}],"modifiedAt":1793713760705,"publishedAt":1793226659693,"references":[{"source":"CNA: GitHub_M","tags":["x_refsource_CONFIRM"],"url":"https://github.com/domoticz/domoticz/security/advisories/GHSA-8rv5-x8wv-c5c4"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/domoticz/domoticz/commit/73ed0495af6de3309f27cfc0091e803300ab5ccd"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/domoticz/domoticz/blob/2026.3/main/WebServerCmds.cpp#L3445-L3451"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/domoticz/domoticz/releases/tag/2026.3"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/domoticz/libwebem/blob/dfe946fa32f4c211662e47ef55b8cedfc50a6a76/include/libwebem/session.h#L10-L17"}],"remediation":[],"revision":"46c677559d8a13cde415502175d9753d94e7a1a829f8e1e363d881a5a3b01f23","sources":[{"modifiedAt":1793713760705,"name":"CNA: GitHub_M","retrievedAt":1793714999436,"url":"https://www.cve.org/CVERecord?id=CVE-2026-75520"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1793715000146,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-75520"}],"ssvc":{"assessedAt":1793713731680,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"Domoticz: Missing authorization and path traversal in the udevices Lua parser handler","updatedAt":1793715000146}