CVE-2026-49332

A flaw was found in openshift/oauth-proxy. The proxy sets authenticated identity headers using only dash-variant keys (X-Forwarded-User) but does not strip underscore-variant keys (X_Forwarded_User) from incoming requests. WSGI and PHP frameworks normalize both variants to the same variable, allowing an authenticated low-privilege user to smuggle a forged identity that may override the legitimate authenticated identity in the upstream application.

CVSS v3 8.5 HIGH

8.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.1 / Impact : 4.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://access.redhat.com/errata/RHSA-2026:50681
https://access.redhat.com/errata/RHSA-2026:50758
https://access.redhat.com/errata/RHSA-2026:51007
https://access.redhat.com/errata/RHSA-2026:51013
https://access.redhat.com/errata/RHSA-2026:51022
https://access.redhat.com/errata/RHSA-2026:51025
https://access.redhat.com/errata/RHSA-2026:51038
https://access.redhat.com/errata/RHSA-2026:54188
https://access.redhat.com/errata/RHSA-2026:54206
https://access.redhat.com/errata/RHSA-2026:56912
https://access.redhat.com/errata/RHSA-2026:60023
https://access.redhat.com/security/cve/CVE-2026-49332
https://bugzilla.redhat.com/show_bug.cgi?id=2483253

Configurations

No configuration.

History

24 Oct 2026, 13:10

Type	Values Removed	Values Added
Summary		(es) Se encontró una vulnerabilidad en openshift/oauth-proxy. El proxy establece encabezados de identidad autenticada utilizando solo claves con variantes de guion (X-Forwarded-User) pero no elimina las claves con variantes de guion bajo (X_Forwarded_User) de las solicitudes entrantes. Los frameworks WSGI y PHP normalizan ambas variantes a la misma variable, permitiendo a un usuario autenticado con bajos privilegios introducir clandestinamente una identidad falsificada que puede anular la identidad autenticada legítima en la aplicación ascendente.

Information

Published : 2026-07-28 13:18

Updated : 2026-10-24 13:10

NVD link : CVE-2026-49332

Mitre link : CVE-2026-49332

CVE.ORG link : CVE-2026-49332

JSON object : View

Products Affected

No product.

CWE

CWE-436

Interpretation Conflict

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"affected"}, {"cpes": ["cpe:/a:redhat:openshift:4.15::el9"], "vendor": "Red Hat", "product": "Red Hat OpenShift Container Platform 4.15", "versions": [{"status": "unaffected", "version": "1787054100", "lessThan": "*", "versionType": "rpm"}], "packageName": "openshift4/ose-oauth-proxy-rhel9", "collectionURL": "https://catalog.redhat.com/software/containers/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:openshift:4.16::el9"], "vendor": "Red Hat", "product": "Red Hat OpenShift Container Platform 4.16", "versions": [{"status": "unaffected", "version": "1785544039", "lessThan": "*", "versionType": "rpm"}], "packageName": "openshift4/ose-oauth-proxy-rhel9", "collectionURL": "https://catalog.redhat.com/software/containers/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:openshift:4.17::el9"], "vendor": "Red Hat", "product": "Red Hat OpenShift Container Platform 4.17", "versions": [{"status": "unaffected", "version": "1787543313", "lessThan": "*", "versionType": "rpm"}], "packageName": "openshift4/ose-oauth-proxy-rhel9", "collectionURL": "https://catalog.redhat.com/software/containers/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:openshift:4.18::el9"], "vendor": "Red Hat", "product": "Red Hat OpenShift Container Platform 4.18", "versions": [{"status": "unaffected", "version": "1785529735", "lessThan": "*", "versionType": "rpm"}], "packageName": "openshift4/ose-oauth-proxy-rhel9", "collectionURL": "https://catalog.redhat.com/software/containers/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:openshift:4.19::el9"], "vendor": "Red Hat", "product": "Red Hat OpenShift Container Platform 4.19", "versions": [{"status": "unaffected", "version": "1785521728", "lessThan": "*", "versionType": "rpm"}], "packageName": "openshift4/ose-oauth-proxy-rhel9", "collectionURL": "https://catalog.redhat.com/software/containers/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:openshift:4.20::el9"], "vendor": "Red Hat", "product": "Red Hat 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The proxy sets authenticated identity headers using only dash-variant keys (X-Forwarded-User) but does not strip underscore-variant keys (X_Forwarded_User) from incoming requests. WSGI and PHP frameworks normalize both variants to the same variable, allowing an authenticated low-privilege user to smuggle a forged identity that may override the legitimate authenticated identity in the upstream application."}, {"lang": "es", "value": "Se encontr\u00f3 una vulnerabilidad en openshift/oauth-proxy. El proxy establece encabezados de identidad autenticada utilizando solo claves con variantes de guion (X-Forwarded-User) pero no elimina las claves con variantes de guion bajo (X_Forwarded_User) de las solicitudes entrantes. Los frameworks WSGI y PHP normalizan ambas variantes a la misma variable, permitiendo a un usuario autenticado con bajos privilegios introducir clandestinamente una identidad falsificada que puede anular la identidad autenticada leg\u00edtima en la aplicaci\u00f3n ascendente."}], "lastModified": "2026-10-24T13:10:00.147", "sourceIdentifier": "secalert@redhat.com"}