{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-94197",
"assignerOrgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab",
"state": "PUBLISHED",
"assignerShortName": "f5",
"dateReserved": "2026-09-30T21:56:14.620Z",
"datePublished": "2026-10-14T14:40:28.582Z",
"dateUpdated": "2026-10-15T16:43:46.770Z"
},
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unknown",
"modules": [
"ExternalAuth"
],
"product": "NGINX Ingress Controller",
"vendor": "F5",
"versions": [
{
"lessThan": "5.7.0",
"status": "affected",
"version": "5.5.0",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "reporter",
"value": "F5 acknowledges Luke Granto for bringing this issue to our attention and following the highest standards of coordinated disclosure."
}
],
"datePublic": "2026-10-14T14:00:00.000Z",
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "An authentication and authorization bypass vulnerability exists in F5 NGINX Kubernetes Ingress Controller (NIC) when configured with the `ExternalAuth` policy or Ingress external authentication. Client-supplied X-Forwarded-Prefix, X-Forwarded-URI, X-Original-URI, and X-Forwarded-Method routing and method headers are forwarded unsanitized into the internal authentication subrequest (handled by the NGINX auth_request directive). As a result, an unauthenticated, remote attacker may spoof request attributes evaluated by the external authentication provider.
Impact:
This vulnerability may allow remote attackers \n\nunauthenticated\n\n access to protected \n\npaths. There is no control plane exposure; this is a data plane issue only.
\n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated."
}
],
"value": "An authentication and authorization bypass vulnerability exists in F5 NGINX Kubernetes Ingress Controller (NIC) when configured with the `ExternalAuth` policy or Ingress external authentication. Client-supplied X-Forwarded-Prefix, X-Forwarded-URI, X-Original-URI, and X-Forwarded-Method routing and method headers are forwarded unsanitized into the internal authentication subrequest (handled by the NGINX auth_request directive). As a result, an unauthenticated, remote attacker may spoof request attributes evaluated by the external authentication provider. \n\nImpact:\nThis vulnerability may allow remote attackers \n\nunauthenticated\n\n access to protected \n\npaths. There is no control plane exposure; this is a data plane issue only.\n\n\n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated."
}
],
"impacts": [
{
"capecId": "CAPEC-151",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-151 Identity Spoofing"
}
]
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
},
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 8.7,
"baseSeverity": "HIGH",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-290",
"description": "CWE-290 Authentication Bypass by Spoofing",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"orgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab",
"shortName": "f5",
"dateUpdated": "2026-10-14T14:40:28.582Z"
},
"references": [
{
"tags": [
"vendor-advisory"
],
"url": "https://my.f5.com/manage/s/article/K000162611"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "NGINX Ingress Controller vulnerability",
"workarounds": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "Customers can configure their external authentication backend to ignore client-supplied `X-Forwarded-*` / `X-Original-*` headers or ensure it only evaluates session tokens rather than forwarded paths.
"
}
],
"value": "Customers can configure their external authentication backend to ignore client-supplied `X-Forwarded-*` / `X-Original-*` headers or ensure it only evaluates session tokens rather than forwarded paths."
}
],
"x_generator": {
"engine": "F5 SIRTBot v1.0"
}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"id": "CVE-2026-94197",
"role": "CISA Coordinator",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"version": "2.0.3",
"timestamp": "2026-10-15T15:53:41.365707Z"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-10-15T16:43:46.770Z"
}
}
]
}
}