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CVE-2026-66005

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
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:c1fec8188a5fe6aa5bd53e8382d8bf36c7051cfb4d79bca97fb5ccdf4a6c0c85
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":6.3,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:4723f7e40eb6d77911431ad5042d6c6a28d2986243484dc985521c1ecec06c7c · sha256:37257a707b04b05a… · /containers/cna/metrics/1/cvssV3_1

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":5.3,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"PASSIVE","valueDensity":"NOT_DEFINED","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpac…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:4723f7e40eb6d77911431ad5042d6c6a28d2986243484dc985521c1ecec06c7c · sha256:37257a707b04b05a… · /containers/cna/metrics/0/cvssV4_0
cwe · 2 assertions

{"cweId":"CWE-183","description":"Permissive List of Allowed Inputs","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:4723f7e40eb6d77911431ad5042d6c6a28d2986243484dc985521c1ecec06c7c · sha256:37257a707b04b05a… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-942","description":"Permissive Cross-domain Security Policy with Untrusted Domains","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:4723f7e40eb6d77911431ad5042d6c6a28d2986243484dc985521c1ecec06c7c · sha256:37257a707b04b05a… · /containers/cna/problemTypes/0/descriptions/1

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","packageURL":"pkg:npm/jan-app","product":"jan","repo":"https://github.com/janhq/jan","vendor":"janhq","versions":[{"lessThanOrEqual":"0.8.4","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"3e1c1e724f696620d89bb4a9cc18a380e0753757","versionType":"git"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:4723f7e40eb6d77911431ad5042d6c6a28d2986243484dc985521c1ecec06c7c · sha256:37257a707b04b05a… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":6.3,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:4723f7e40eb6d77911431ad5042d6c6a28d2986243484dc985521c1ecec06c7c · sha256:37257a707b04b05a… · /containers/cna/metrics/1/cvssV3_1
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":5.3,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"PASSIVE","valueDensity":"NOT_DEFINED","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpac…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:4723f7e40eb6d77911431ad5042d6c6a28d2986243484dc985521c1ecec06c7c · sha256:37257a707b04b05a… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"cweId":"CWE-183","description":"Permissive List of Allowed Inputs","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:4723f7e40eb6d77911431ad5042d6c6a28d2986243484dc985521c1ecec06c7c · sha256:37257a707b04b05a… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-942","description":"Permissive Cross-domain Security Policy with Untrusted Domains","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:4723f7e40eb6d77911431ad5042d6c6a28d2986243484dc985521c1ecec06c7c · sha256:37257a707b04b05a… · /containers/cna/problemTypes/0/descriptions/1

Source references

4 source assertions
{"name":"Patch Commit","tags":["patch"],"url":"https://github.com/janhq/jan/commit/3e1c1e724f696620d89bb4a9cc18a380e0753757"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4723f7e40eb6d77911431ad5042d6c6a28d2986243484dc985521c1ecec06c7c · sha256:37257a707b04b05a… · /containers/cna/references/2
{"name":"Researcher Disclosure","tags":["technical-description","exploit","issue-tracking"],"url":"https://github.com/janhq/jan/issues/8453"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4723f7e40eb6d77911431ad5042d6c6a28d2986243484dc985521c1ecec06c7c · sha256:37257a707b04b05a… · /containers/cna/references/0
{"name":"Pull Request","tags":["issue-tracking","patch"],"url":"https://github.com/janhq/jan/pull/8506"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4723f7e40eb6d77911431ad5042d6c6a28d2986243484dc985521c1ecec06c7c · sha256:37257a707b04b05a… · /containers/cna/references/1
{"tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/jan-local-api-server-cors-origin-reflection-via-binding"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4723f7e40eb6d77911431ad5042d6c6a28d2986243484dc985521c1ecec06c7c · sha256:37257a707b04b05a… · /containers/cna/references/3

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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