CVE-2026-100725
Full vulnerability record from the local CVENow database.
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.
Severity
HIGH
CVSS score
8.3
(v4.0)
Vulnerability status
Deferred
Source identifier
Published
2026-09-27 02:17:20.760000
Last modified
2026-10-29 21:17:06.990000
View original CVE JSON
{
"id": "CVE-2026-100725",
"sourceIdentifier": "[email protected]",
"published": "2026-09-27T02:17:20.760",
"lastModified": "2026-10-29T21:17:06.990",
"vulnStatus": "Deferred",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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": [
{
"source": "[email protected]",
"affectedData": [
{
"vendor": "http4k",
"product": "http4k",
"defaultStatus": "unaffected",
"packageURL": "pkg:maven/org.http4k/http4k-core",
"versions": [
{
"version": "6.0.0.0",
"lessThan": "6.48.0.0",
"versionType": "custom",
"status": "affected"
},
{
"version": "6.48.0.0",
"versionType": "custom",
"status": "unaffected"
}
]
},
{
"vendor": "http4k",
"product": "http4k",
"defaultStatus": "unaffected",
"packageURL": "pkg:maven/org.http4k/http4k-core",
"versions": [
{
"version": "5.0.0.0",
"lessThan": "5.42.0.0",
"versionType": "custom",
"status": "affected"
},
{
"version": "5.42.0.0",
"versionType": "custom",
"status": "unaffected"
}
]
},
{
"vendor": "http4k",
"product": "http4k",
"defaultStatus": "unaffected",
"packageURL": "pkg:maven/org.http4k/http4k-core",
"versions": [
{
"version": "0",
"lessThan": "4.51.0.0",
"versionType": "custom",
"status": "affected"
},
{
"version": "4.51.0.0",
"versionType": "custom",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV40": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "4.0",
"vectorString": "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/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",
"baseScore": 8.3,
"baseSeverity": "HIGH",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "LOW",
"vulnAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"subAvailabilityImpact": "NONE",
"exploitMaturity": "NOT_DEFINED",
"confidentialityRequirement": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"availabilityRequirement": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"valueDensity": "NOT_DEFINED",
"vulnerabilityResponseEffort": "NOT_DEFINED",
"providerUrgency": "NOT_DEFINED"
}
}
],
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"attackVector": "NETWORK",
"attackComplexity": "HIGH",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "LOW",
"availabilityImpact": "NONE"
},
"exploitabilityScore": 2.2,
"impactScore": 4.2
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-09-28T16:47:23.806596Z",
"id": "CVE-2026-100725",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-200"
}
]
}
],
"references": [
{
"url": "https://github.com/http4k/http4k/commit/6a9b44d743",
"source": "[email protected]"
},
{
"url": "https://github.com/http4k/http4k/security/advisories/GHSA-pr33-38xx-6r26",
"source": "[email protected]"
},
{
"url": "https://www.vulncheck.com/advisories/http4k-before-6.48.0.0-cookie-scoping-bypass-via-basiccookiestorage",
"source": "[email protected]"
}
]
}