---
id: CVE-2026-100725
title: >-
  http4k (Maven artifact org.http4k:http4k-core) before 6.48.0.0, 5.42.0.0, and
  4.51.0.0 ships a BasicCookieStorage (client-side cookie store used by
  ClientFilters.Cookies) that does not enforce RFC 6265 scoping rules for the
  cookie domain…
summary: >-
  http4k (Maven artifact org.http4k:http4k-core) before 6.48.0.0, 5.42.0.0, and
  4.51.0.0 ships a BasicCookieStorage (client-side cookie store used by
  ClientFilters.Cookies) that does not enforce RFC 6265 scoping rules for the
  cookie domain…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N'
cwe:
  - CWE-200
vendor: http4k
product: http4k
affected:
  - http4k < 6.48.0.0
  - http4k < 5.42.0.0
  - http4k < 4.51.0.0
published: '2026-09-27'
updated: '2026-09-27'
sourceUpdated: '2026-09-27T02:17:20.760'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-100725'
references:
  - url: 'https://github.com/http4k/http4k/commit/6a9b44d743'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/http4k/http4k/security/advisories/GHSA-pr33-38xx-6r26'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/http4k-before-6.48.0.0-cookie-scoping-bypass-via-basiccookiestorage
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-27T02:41:45.567Z'
---

## Overview

http4k (Maven artifact org.http4k:http4k-core) before 6.48.0.0, 5.42.0.0, and 4.51.0.0 ships a BasicCookieStorage (client-side cookie store used by ClientFilters.Cookies) that does not enforce RFC 6265 scoping rules for the cookie domain, path, and Secure attributes. When a single BasicCookieStorage instance is used to talk to more than one origin or scheme, cookies stored for one origin can be sent to other origins, and cookies marked Secure can be sent over plain HTTP, potentially disclosing session cookies or other sensitive values to unauthorized hosts or network observers. Clients that use a storage instance for a single origin are not affected.

## Remediation

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