---
id: CVE-2026-83589
title: A flaw was found in oauth-proxy
summary: >-
  A flaw was found in oauth-proxy. The application fails to properly validate
  the destination redirect parameter (`rd`) during post-login redirection. A
  remote attacker can exploit this vulnerability by enticing a user to follow a
  speciall…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-601
vendor: Red Hat
product: openshift4/ose-oauth-proxy-rhel9
affected:
  - 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 (all versions)
patched:
  - openshift_container_platform 4.20
  - openshift_container_platform 4.21
  - openshift_container_platform 4.22
published: '2026-10-01'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T06:17:05.160'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-83589'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:74380'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:74383'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:74429'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:79169'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-83589'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2518379'
    label: secalert@redhat.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-83589.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-83589'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-83589'
  - url: 'https://access.redhat.com/errata/RHSA-2026:79039'
    label: 'RHSA-2026:79039'
  - url: 'https://access.redhat.com/errata/RHSA-2026:82785'
    label: 'RHSA-2026:82785'
  - url: 'https://access.redhat.com/errata/RHSA-2026:82813'
    label: 'RHSA-2026:82813'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00282
epssPercentile: 0.20636
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-01T16:11:43.615229Z'
ingestedAt: '2026-10-01T09:41:14.165Z'
---

## Overview

A flaw was found in oauth-proxy. The application fails to properly validate the destination redirect parameter (`rd`) during post-login redirection. A remote attacker can exploit this vulnerability by enticing a user to follow a specially crafted link, resulting in the user being redirected to an arbitrary external website after authenticating. This open redirect can be leveraged to conduct phishing attacks or credential theft.

## Remediation

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

## Vendor advisories

- **RHSA-2026:74380** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.20 · released 2026-10-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:74380)
- **RHSA-2026:74383** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.21 · released 2026-10-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:74383)
- **RHSA-2026:74429** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.22 · released 2026-10-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:74429)
- **Red Hat VEX** · Important · affected: Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat OpenShift Container Platform 4 · updated 2026-10-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-83589.json)
- **RHSA-2026:79169** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.19 · released 2026-10-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:79169)