CVE-2026-66005

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.33% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 25.9% of scored records. A rank, not a probability.

NVD base score

5.3 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD 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

NVD analysis status

Deferred. NVD last modified this record on 2026-10-24.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-07-24 14:57Z3 MO AGO

Last updated

2026-09-17 17:54Z1 MO AGO

Reserved

2026-07-23

Assigning CNA

VulnCheck

Record state

PUBLISHED

Severity

Medium (CVSS 5.3)

CNA 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

Weaknesses

• CWE-183Permissive List of Allowed InputsBase
• CWE-942Permissive Cross-domain Security Policy with Untrusted DomainsVariant

Data version

5.2

Document digest

17feef0fe75dd0f745083d0427a711875c629fee9979df0cfb65eac3352beb99

• github.comResearcher Disclosurehttps://github.com/janhq/jan/issues/8453technical-descriptionexploitissue-tracking
• github.comPull Requesthttps://github.com/janhq/jan/pull/8506issue-trackingpatch
• github.comPatch Commithttps://github.com/janhq/jan/commit/3e1c1e724f696620d89bb4a9cc18a380e0753757patch
• www.vulncheck.comhttps://www.vulncheck.com/advisories/jan-local-api-server-cors-origin-reflection-via-bindingthird-party-advisory