http4k before 6.48.0.0 Cookie Scoping Bypass via BasicCookieStorage
Published Sep 27, 2026
8.3
HIGHCVSS 4.0
EPSS 0.24%
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 products
No data.
No data.
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed Sep 28, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
Oct 2026- EPSS v5
Percentile over time
- EPSS v5
Table of values (2 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 0.24% (0.00239) | 13.62th | v5 (v2026.06.15) |
| Oct 1, 2026 | 0.24% (0.00239) | 13.57th | v5 (v2026.06.15) |
References (3)
- https://github.com/http4k/http4k/commit/6a9b44d743 patch
- https://github.com/http4k/http4k/security/advisories/GHSA-pr33-38xx-6r26 vendor-advisory
- https://www.vulncheck.com/advisories/http4k-before-6.48.0.0-cookie-scoping-bypass-via-basiccookiestorage third-party-advisory
| Link | Providers | Tags |
|---|---|---|
| https://github.com/http4k/http4k/commit/6a9b44d743 | patch | |
| https://github.com/http4k/http4k/security/advisories/GHSA-pr33-38xx-6r26 | vendor-advisory | |
| https://www.vulncheck.com/advisories/http4k-before-6.48.0.0-cookie-scoping-bypass-via-basiccookiestorage | third-party-advisory |
Change history (0)
No recorded changes yet.