{"id":"CVE-2026-66005","title":"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-…","summary":"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-…","severity":"medium","cvss":6.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L","cwe":["CWE-183","CWE-942"],"vendor":"janhq","product":"jan","affected":["jan <= 0.8.4"],"published":"2026-07-24","updated":"2026-09-17","sourceUpdated":"2026-09-17T18:17:02.120","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-66005","references":[{"url":"https://github.com/janhq/jan/commit/3e1c1e724f696620d89bb4a9cc18a380e0753757","label":"disclosure@vulncheck.com"},{"url":"https://github.com/janhq/jan/issues/8453","label":"disclosure@vulncheck.com"},{"url":"https://github.com/janhq/jan/pull/8506","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/jan-local-api-server-cors-origin-reflection-via-binding","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-07-24T15:32:21.328068Z"},"epss":0.00198,"epssPercentile":0.0983,"ingestedAt":"2026-09-17T18:25:15.980Z","slug":"CVE-2026-66005","body":"## Overview\n\nJan 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":47,"depthScoreParts":{"impact":34.7,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[]}