---
id: CVE-2026-18825
title: >-
  An Origin Validation Error in the middleware of the connect-xcors npm package
  allows an attacker to bypass origin verification and perform a cross domain
  authenticated request.
summary: >-
  An Origin Validation Error in the middleware of the connect-xcors npm package
  allows an attacker to bypass origin verification and perform a cross domain
  authenticated request.
severity: medium
cvss: 5.3
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N'
cwe:
  - CWE-346
vendor: github.com/antono
product: connect-xcors
affected:
  - connect-xcors <= 0.5.6
published: '2026-09-28'
updated: '2026-09-28'
sourceUpdated: '2026-09-28T13:17:21.680'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-18825'
references:
  - url: 'https://cds.thalesgroup.com/en/tcs-cert/CVE-2026-18825'
    label: 64c5ae8f-7972-4697-86a0-7ada793ac795
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-28T13:02:07.195221Z'
cvssSource: cna
ingestedAt: '2026-09-28T13:09:42.236Z'
---

## Overview

An Origin Validation Error in the middleware of the connect-xcors npm package allows an attacker to bypass origin verification and perform a cross domain authenticated request.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.