{"id":"CVE-2026-66005","summary":"Jan Local API Server CORS Origin Reflection via 0.0.0.0 Binding","details":"Jan through 0.8.4, fixed in commit 3e1c1e7, contains a CORS misconfiguration vulnerability in its local API server that allows network-adjacent attackers to bypass trusted host restrictions by exploiting the server's replacement of user-configured trusted hosts with a wildcard that reflects arbitrary origins with credentials. Attackers on the local network or using DNS rebinding can reach the unauthenticated OpenAI-compatible API to perform inference, enumerate models, invoke MCP tools, and read cross-origin responses.","modified":"2026-07-27T04:03:24.074615115Z","published":"2026-07-24T14:57:33.054Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/66xxx/CVE-2026-66005.json","cna_assigner":"VulnCheck","cwe_ids":["CWE-183","CWE-942"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/66xxx/CVE-2026-66005.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-66005"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/jan-local-api-server-cors-origin-reflection-via-binding"},{"type":"REPORT","url":"https://github.com/janhq/jan/issues/8453"},{"type":"FIX","url":"https://github.com/janhq/jan/commit/3e1c1e724f696620d89bb4a9cc18a380e0753757"},{"type":"FIX","url":"https://github.com/janhq/jan/pull/8506"},{"type":"PACKAGE","url":"https://github.com/janhq/jan"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/janhq/jan","events":[{"introduced":"0"},{"fixed":"5f30aee467f08941964a83f946e2663e7ae0e01f"},{"fixed":"3e1c1e724f696620d89bb4a9cc18a380e0753757"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"0.8.4"}],"source":["DESCRIPTION","REFERENCES"]}}],"versions":["v0.5.17-rc1-beta","v0.5.17","v0.5.16-rc1-beta","v0.5.14-rc1-beta","v0.5.11-rc2-beta","v0.5.10-rc1-beta","v0.5.1","v0.5.0","v0.4.14","v0.4.13","v0.4.12","v0.4.11","v0.4.10","v0.4.9","v0.4.8","v0.4.7","v0.4.6","v0.4.5","v0.4.4","v0.4.3","v0.4.2","v0.4.1","v0.4.0","v0.3.3","v0.3.2","v0.3.1","core-0.1.10","inference-plugin-1.0.21","inference-plugin-1.0.20","model-management-plugin-1.0.13","inference-plugin-1.0.19","monitoring-plugin-1.0.9","inference-plugin-1.0.18","model-management-plugin-1.0.12","inference-plugin-1.0.17","data-plugin-1.0.19","monitoring-plugin-1.0.8","model-management-plugin-1.0.11","inference-plugin-1.0.16","data-plugin-1.0.18","core-0.1.9","data-plugin-1.0.16","v0.3.0","v0.2.3","core-0.1.8","data-plugin-1.0.15","openai-plugin-1.0.7","v0.2.2","retrieval-plugin-1.0.3","inference-plugin-1.0.14","data-plugin-1.0.14","data-plugin-1.0.13","data-plugin-1.0.12","data-plugin-1.0.11","v0.2.1","data-plugin-1.0.10","inference-plugin-1.0.13","model-management-plugin-1.0.9","data-plugin-1.0.9","inference-plugin-1.0.12","core-0.1.7","inference-plugin-1.0.11","data-plugin-1.0.8","retrieval-plugin-1.0.2","inference-plugin-1.0.10","openai-plugin-1.0.6","monitoring-plugin-1.0.6","model-management-plugin-1.0.8","inference-plugin-1.0.9","data-plugin-1.0.7","inference-plugin-1.0.8","core-0.1.6","retrieval-plugin-1.0.1","model-management-plugin-1.0.7","data-plugin-1.0.6","inference-plugin-1.0.7","core-0.1.5","core-0.1.4","core-0.1.3","model-management-plugin-1.0.4","openai-plugin-1.0.3","monitoring-plugin-1.0.3","model-management-plugin-1.0.3","inference-plugin-1.0.4","data-plugin-1.0.3","inference-plugin-1.0.3","core-0.1.2","openai-plugin-1.0.2","monitoring-plugin-1.0.2","model-management-plugin-1.0.2","inference-plugin-1.0.2","data-plugin-1.0.2","core-0.1.1","plugin-core-0.1.8","plugin-core-0.1.7","plugin-core-0.1.6","plugin-core-0.1.5","plugin-core-0.1.4","v0.2.0","v0.1.3","v0.1.1","v0.1.2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-66005.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N"}]}