CVE-2026-49332

Red Hat OpenShift Container Platform 4VulnerabilityCVSS 8.5

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.

No public exploitation has been reported so far. No distribution fix is listed yet; apply vendor mitigations and monitor.

Recommended action: Track your distribution's security tracker and apply the fix as soon as it ships.

CVE-2026-49332 Red Hat OpenShift Container Platform 4 Vulnerability

Severity metrics

CVSS 3.1 : 8.5 HIGH

Attack vectorNetwork (remote)

Attack complexityLow

Privileges requiredLow

User interactionNone

ScopeChanged

Confidentiality impactHigh

Integrity impactLow

Availability impactNone

Vector: AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

Affected & fixed versions by distribution

Versions are the native distribution strings (backport-aware): RHEL/Debian/SUSE backport fixes, so compare with the distro version comparator (dpkg / rpm / vercmp), not the upstream version.

No affected package in the tracked watchlist yet (Debian, Ubuntu, Arch, SUSE, Red Hat...). Triage may still be pending.

Sources

Advisory NVD CVE.org

Published 2026-07-28 · source: NVD