{"affected":[{"defaultStatus":"unaffected","product":"TR3000 1.0","source":"CNA: VulnCheck","vendor":"Shenzhen Cudy Technology Co., Ltd.","versions":[{"lessThan":"2.5.42","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"2.5.42","versionType":"semver"}]}],"cveId":"CVE-2026-75491","cwes":["CWE-347"],"description":"Cudy TR3000 before 2.5.42 contains an authentication bypass vulnerability in the Mosquitto plugin auth_plugin_jwt.so that accepts unsigned JWTs using alg none. Attackers holding any Cudy-trusted client certificate can authenticate as admincudydevice on port 8883 and publish batchcmd requests to execute commands as root.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":9.2,"severity":"critical","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0"},{"score":8.1,"severity":"high","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},{"score":9.2,"severity":"critical","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","version":"4.0"},{"score":8.1,"severity":"high","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}],"modifiedAt":1794565096597,"publishedAt":1794562616502,"references":[{"source":"CNA: VulnCheck","tags":["release-notes"],"url":"https://www.cudy.com/en-us/pages/download-center/tr3000-1-0"},{"source":"CNA: VulnCheck","tags":["patch"],"url":"https://d1jvyy13vm72kv.cloudfront.net/device/upgrade/m_upgrade_TR3000_256MB_Flash-R103-2.5.42-20261103-160202-sysupgrade_82672.zip"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/cudy-tr3000-before-2.5.42-mqtt-jwt-authentication-bypass-via-alg-none-tokens"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://d1jvyy13vm72kv.cloudfront.net/device/upgrade/m_upgrade_TR3000_256MB_Flash-R103-2.5.42-20261103-160202-sysupgrade_82672.zip"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://www.cudy.com/en-us/pages/download-center/tr3000-1-0"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://www.vulncheck.com/advisories/cudy-tr3000-before-2.5.42-mqtt-jwt-authentication-bypass-via-alg-none-tokens"}],"remediation":[{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://d1jvyy13vm72kv.cloudfront.net/device/upgrade/m_upgrade_TR3000_256MB_Flash-R103-2.5.42-20261103-160202-sysupgrade_82672.zip"}],"revision":"cac676a70727d1681bd905b713abb0de6657ab026ac1f2d708968a56cc28e9d0","sources":[{"modifiedAt":1794562616502,"name":"CNA: VulnCheck","retrievedAt":1794564888653,"url":"https://www.cve.org/CVERecord?id=CVE-2026-75491"},{"modifiedAt":1794565096597,"name":"NVD","retrievedAt":1794572261417,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-75491"}],"ssvc":null,"status":"published","title":"Cudy TR3000 before 2.5.42 MQTT JWT Authentication Bypass via alg none Tokens","updatedAt":1794572261417}