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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-66005 Detail

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

Nist CVSS score does not match with CNA score
CNA:  VulnCheck
CVSS-B 5.3 MEDIUM
Vector:  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

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://github.com/janhq/jan/commit/3e1c1e724f696620d89bb4a9cc18a380e0753757 VulnCheck
https://github.com/janhq/jan/issues/8453 VulnCheck
https://github.com/janhq/jan/pull/8506 VulnCheck
https://www.vulncheck.com/advisories/jan-local-api-server-cors-origin-reflection-via-binding VulnCheck

Weakness Enumeration

CWE-ID CWE Name Source
CWE-183 Permissive List of Allowed Inputs VulnCheck  
CWE-942 Permissive Cross-domain Policy with Untrusted Domains VulnCheck  

Change History

2 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-66005
NVD Published Date:
07/24/2026
NVD Last Modified:
07/24/2026
Source:
VulnCheck