Vulnerability · Published Sep 27, 2026 · Assigned by VulnCheck
CVE-2026-100725http4k before 6.48.0.0 Cookie Scoping Bypass via BasicCookieStorage
Medium 6.5
In plain English
A medium-severity information exposure in http4k from http4k. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Maven | org.http4k:http4k-core | 6.48.0.0 | GHSA-pr33-38xx-6r26 |
| Maven | org.http4k:http4k-core | 5.42.0.0 | GHSA-pr33-38xx-6r26 |
| Maven | org.http4k:http4k-core | 4.51.0.0 | GHSA-pr33-38xx-6r26 |
Affected products (as reported)
Weakness: CWE-200 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
References
- GitHub Security Advisory (GHSA-pr33-38xx-6r26) vendor-advisory
- Patch Commit patch
- VulnCheck Advisory: http4k before 6.48.0.0 Cookie Scoping Bypass via BasicCookieStorage third-party-advisory