Oauth-proxy: open redirect via /\ and /\t bypass in post-login redirect (CVE-2026-83589) | HOL Guard CVE

Medium · CVSS 6.1CVE-2026-83589

Oauth-proxy: open redirect via /\ and /\t bypass in post-login redirect

Answer in brief

CVE-2026-83589 records a Medium severity (CVSS 6.1) vulnerability in Oauth-proxy: open redirect via /\ and /\t bypass in post-login redirect. The current sources do not mark it as known exploited. The current feed maps Red Hat/openshift4/ose-oauth-proxy (generic), Red Hat/openshift4/ose-oauth-proxy-rhel9 (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 1, 2026Updated Oct 1, 2026Source checked Oct 1, 2026First seen by HOL Oct 1, 2026Material review Oct 1, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 6.1
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Not reported

Why this deserves its current priority

CVSS is 6.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/openshift4/ose-oauth-proxy (generic), Red Hat/openshift4/ose-oauth-proxy-rhel9 (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Red Hat/openshift4/ose-oauth-proxygeneric	*	Not reported
Red Hat/openshift4/ose-oauth-proxy-rhel9generic	*	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Red Hat/openshift4/ose-oauth-proxy, Red Hat/openshift4/ose-oauth-proxy-rhel9.
Review the reported fix. Source-reported workaround: Red Hat has not identified any known mitigations for this issue. Customers are advised to apply the available security update when released.

Evidence timeline and material changes

Published upstream
Oct 1, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 1, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 1, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.