EUVD-2026-49767
GHSA-f2m2-cc3f-h4j2
Severity by source
AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
Primary rating from Vendor (redhat).
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
Lifecycle Timeline
2DescriptionNVD
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.
Articles & Coverage 1
AnalysisAI
Identity header smuggling in OpenShift Container Platform 4.x allows authenticated low-privilege users to escalate privileges by injecting forged identity headers that upstream applications may trust. The oauth-proxy fails to strip underscore-variant headers, enabling WSGI and PHP frameworks to normalize them into the legitimate identity, potentially overriding the true authenticated user. …
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Same weakness CWE-436 – Interpretation Conflict
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External POC / Exploit Code
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