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Findings

CVE-2026-83589

A flaw was found in oauth-proxy.

Published Oct 1, 2026 · corrected/updated Oct 15, 2026 · Red Hat Red Hat OpenShift Container Platform 4.19 · evidence confidence high

A flaw was found in oauth-proxy. The application fails to properly validate the destination redirect parameter ( ) 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.

Grounded briefings

Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.

Executive

CVE-2026-83589 is a medium public vulnerability record for Red Hat Red Hat OpenShift Container Platform 4.19. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.

System administrator

Identify whether Red Hat Red Hat OpenShift Container Platform 4.19 is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: Red Hat Red Hat OpenShift Container Platform 4; Red Hat Red Hat OpenShift Container Platform 4.19; Red Hat Red Hat OpenShift Container Platform 4.20; Red Hat Red Hat OpenShift Container Platform 4.21. Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.

Security analyst

Signals on file: CVSS 6.1, EPSS 0.2%. It is not currently listed in the CISA Known Exploited catalog. Weakness classes: CWE-601. Sources contributing to this record: circl, cve_org, epss, nvd. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.

Exploitation and remediation

  • Exploitation evidence

    Not listed as known exploited in CISA KEV. Not in CISA KEV or VulnCheck KEV.

  • Patch and remediation

    No required-action text is stored yet. Use the vendor or CERT links in Sources for patch availability.

  • Safe detection guidance

    Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.

Technology hubs

Kubernetes

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 1, 2026 · NIST NVD

    Detected

    A flaw was found in oauth-proxy. The application fails to properly validate the destination redirect parameter ( ) 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

  2. Oct 15, 2026 · NIST NVD

    Updated

    A flaw was found in oauth-proxy. The application fails to properly validate the destination redirect parameter ( ) 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

Affected

  • vendor Red Hat Red Hat OpenShift Container Platform 4version unspecified
  • vendor Red Hat Red Hat OpenShift Container Platform 4.19version unspecified
  • vendor Red Hat Red Hat OpenShift Container Platform 4.20version unspecified
  • vendor Red Hat Red Hat OpenShift Container Platform 4.21version unspecified
  • vendor Red Hat Red Hat OpenShift Container Platform 4.22version unspecified

Sources

  • CIRCL Vulnerability LookupVulnerability recordCVE-2026-83589

    A flaw was found in oauth-proxy. The application fails to properly validate the destination redirect parameter ( ) 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 re

    vulnerability.circl.lu
  • CVE.orgVulnerability recordCVE-2026-83589

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-83589

    30-day exploitation probability 0.2%

    first.org
  • NIST NVDVulnerability recordCVE-2026-83589

    A flaw was found in oauth-proxy. The application fails to properly validate the destination redirect parameter ( ) 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

    nvd.nist.gov

References