Reference page — cumulative record through Thursday, October 8, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2026-83589
Red Hat Red Hat OpenShift Container Platform 4.20 — Oauth-proxy: open redirect via /\ and /\t bypass in post-login redirect
AV AC PR UI S C I A CVSS EPSS %ile KEV
N L N R C L L N 6.1 .0024 13.9 —
AFFECTED
Product Versions Fixed
Red Hat OpenShift Container Platform 4.20 unspecified 1790704224
Red Hat OpenShift Container Platform 4.21 unspecified 1790706478
Red Hat OpenShift Container Platform 4.22 unspecified 1790724885
Red Hat OpenShift Container Platform 4 unspecified —
TIMELINE
Aug 31 Reserved by redhat
Oct 1 Published (CNA: redhat)
Oct 5 PATCH SHIPPED — CVE-2026-83589 (Red Hat OpenShift Container Platform 4.21). Fixed in Red Hat OpenShift Container Platform 4.21 1790706478.
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.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| August 31, 2026 | Reserved | Reserved by redhat |
| October 1, 2026 | Published | Published (CNA: redhat) |
| October 5, 2026 | PATCH SHIPPED | PATCH SHIPPED — CVE-2026-83589 (Red Hat OpenShift Container Platform 4.21). Fixed in Red Hat OpenShift Container Platform 4.21 1790706478. |
Affected
Affected products and packages — 4 rows
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| Red Hat | Red Hat OpenShift Container Platform 4.20 | — | — | 1790704224 |
| Red Hat | Red Hat OpenShift Container Platform 4.21 | — | — | 1790706478 |
| Red Hat | Red Hat OpenShift Container Platform 4.22 | — | — | 1790724885 |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-83589 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Thursday, October 8, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
