---
id: CVE-2026-49332
title: A flaw was found in openshift/oauth-proxy
summary: >-
  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 f…
severity: high
cvss: 8.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N'
cwe:
  - CWE-436
vendor: Red Hat
product: openshift4/ose-oauth-proxy
affected:
  - openshift4/ose-oauth-proxy (all versions)
  - openshift4/ose-oauth-proxy (all versions)
  - openshift4/ose-oauth-proxy (all versions)
  - openshift4/ose-oauth-proxy-rhel9 (all versions)
  - openshift4/ose-oauth-proxy-rhel9 (all versions)
  - openshift4/ose-oauth-proxy-rhel9 (all versions)
  - openshift4/ose-oauth-proxy-rhel9 (all versions)
  - openshift4/ose-oauth-proxy-rhel9 (all versions)
  - openshift4/ose-oauth-proxy-rhel9 (all versions)
  - openshift4/ose-oauth-proxy-rhel9 (all versions)
  - openshift4/ose-oauth-proxy-rhel9 (all versions)
published: '2026-07-28'
updated: '2026-09-21'
sourceUpdated: '2026-09-21T17:17:35.260'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-49332'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:50681'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:50758'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:51007'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:51013'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:51022'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:51025'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:51038'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:54188'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:54206'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:56912'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:60023'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-49332'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2483253'
    label: secalert@redhat.com
tags:
  - nvd
  - cve.org
epss: 0.00531
epssPercentile: 0.42384
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-07-28T13:02:35.727357Z'
ingestedAt: '2026-08-16T10:37:48.125Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.