# CVE-2026-66005

## Summary

- **CVE ID:** CVE-2026-66005
- **Severity:** MEDIUM
- **CVSS Score:** 6.3 (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)
- **CWE:** CWE-183, CWE-942
- **Published:** Jul 24, 2026
- **Last Modified:** Jul 25, 2026

## Description

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.

## Affected Products

- janhq — jan (0)
- janhq — jan (3e1c1e724f696620d89bb4a9cc18a380e0753757)

## References

- [CNA](https://github.com/janhq/jan/issues/8453)
- [CNA](https://github.com/janhq/jan/pull/8506)
- [CNA](https://github.com/janhq/jan/commit/3e1c1e724f696620d89bb4a9cc18a380e0753757)
- [CNA](https://www.vulncheck.com/advisories/jan-local-api-server-cors-origin-reflection-via-binding)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.20%
- **EPSS Percentile:** 9.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._