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CVE-2026-66005

Jan Local API Server CORS Origin Reflection via 0.0.0.0 Binding

CVSS 4.0 5.3 MEDIUMCVSS 3.1 6.3 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-66005

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-66005

Published

jan

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "janhq",
                    "product": "jan",
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:github/janhq/jan",
                    "versions": [
                        {
                            "version": "0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThanOrEqual": "0.8.4"
                        },
                        {
                            "status": "unaffected",
                            "version": "3e1c1e724f696620d89bb4a9cc18a380e0753757",
                            "versionType": "git"
                        }
                    ],
                    "repo": "https://github.com/janhq/jan"
                }

Original source record · Cite this exact observation · Complete original publisher JSON