CVE-2026-49332highCWE-436

CVE-2026-49332: high-severity vulnerability in Red Hat OpenShift Container Platform 4.12

Openshift/oauth-proxy: openshift/oauth-proxy: underscore header smuggling enables identity impersonation on wsgi/php upstreams

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21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 8.5epss 0.5%
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:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
Affected products
Red Hat · Red Hat OpenShift Container Platform 4.12Red Hat · Red Hat OpenShift Container Platform 4.13Red Hat · Red Hat OpenShift Container Platform 4.14Red Hat · Red Hat OpenShift Container Platform 4.15Red Hat · Red Hat OpenShift Container Platform 4.16Red Hat · Red Hat OpenShift Container Platform 4.17Red Hat · Red Hat OpenShift Container Platform 4.18Red Hat · Red Hat OpenShift Container Platform 4.19Red Hat · Red Hat OpenShift Container Platform 4.20Red Hat · Red Hat OpenShift Container Platform 4.21Red Hat · Red Hat OpenShift Container Platform 4.22
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