CVE-2026-66005Jan Local API Server CORS Origin Reflection via 0.0.0.0 Binding
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 6.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
- Weakness (CWE)
- CWE-183, CWE-942
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Sep 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
janhq jan janhq:jan (from the name) | through 0.8.4; 3e1c1e724f696620d89bb4a9cc18a380e0753757 not affected | CNA record |
References
- https://github.com/janhq/jan/issues/8453technical-description, exploit, issue-tracking
- https://github.com/janhq/jan/pull/8506issue-tracking, patch
- https://github.com/janhq/jan/commit/3e1c1e724f696620d89bb4a9cc18a380e0753757patch
- https://www.vulncheck.com/advisories/jan-local-api-server-cors-origin-reflection-via-bindingthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.