Is there a public PoC exploit available for CVE-2026-66005?

Yes, a public proof-of-concept exploit is available for CVE-2026-66005. Prioritise patching immediately. EPSS: 0.2%.

Is there a patch available for CVE-2026-66005?

Yes, a patch is available for CVE-2026-66005. Update the affected software to the latest version immediately.

Jan CVE-2026-66005

Q: What is the CVSS score of CVE-2026-66005?

CVE-2026-66005 has a CVSS 4.0 base score of 5.3 (Medium). CVSS 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.2%.

EUVD-2026-48611 MEDIUM

Permissive List of Allowed Inputs (CWE-183)

2026-07-24 VulnCheck

GHSA-4r96-7xrx-4gcr

Authentication Bypass Jan

5.3

CVSS 4.0 · Vendor: VulnCheck

Severity by source

Vendor (VulnCheck) PRIMARY

5.3 MEDIUM

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from Vendor (VulnCheck) · only source for this CVE.

CVSS VectorVendor: VulnCheck

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Scope

Lifecycle Timeline

Source Code Evidence Fetched

Jul 26, 2026 - 12:16 vuln.today

Analysis Generated

Jul 26, 2026 - 12:16 vuln.today

CVE Published

Jul 24, 2026 - 14:57 cve.org

MEDIUM 5.3

DescriptionCVE.org

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.

AnalysisAI

A CORS misconfiguration in Jan up to version 0.8.4 allows network-adjacent attackers to bypass trusted host restrictions when the server is bound to 0.0.0.0, enabling unauthorized access to the OpenAI-compatible API for model enumeration, inference, and MCP tool invocation. A publicly available exploit exists, and CISA KEV does not list active exploitation; EPSS score is low at 0.19%, indicating limited real-world exploitation risk.