# Oauth-proxy: open redirect via /\ and /\t bypass in post-login redirect CVE record · `CVE-2026-83589` - **Identifiers:** `CVE-2026-83589` - **State:** Confirmed - **Severity:** CVSS 6.1 Medium - **Critical:** No - **CNA:** redhat - **Weakness (CWE):** [CWE-601](https://cwe.mitre.org/data/definitions/601.html) - **Tags:** [Open redirect](https://agentprime.io/advisories/tag/open-redirect.md) - **Technologies:** [Red Hat OpenShift Container Platform 4.12](https://agentprime.io/advisories/technology/red-hat-openshift-container-platform-4-12.md) · [Red Hat OpenShift Container Platform 4.14](https://agentprime.io/advisories/technology/red-hat-openshift-container-platform-4-14.md) · [Red Hat OpenShift Container Platform 4.15](https://agentprime.io/advisories/technology/red-hat-openshift-container-platform-4-15.md) · [Red Hat OpenShift Container Platform 4.16](https://agentprime.io/advisories/technology/red-hat-openshift-container-platform-4-16.md) · [Red Hat OpenShift Container Platform 4.18](https://agentprime.io/advisories/technology/red-hat-openshift-container-platform-4-18.md) · [Red Hat OpenShift Container Platform 4.19](https://agentprime.io/advisories/technology/red-hat-openshift-container-platform-4-19.md) · [Red Hat OpenShift Container Platform 4.20](https://agentprime.io/advisories/technology/red-hat-openshift-container-platform-4-20.md) · [Red Hat OpenShift Container Platform 4.21](https://agentprime.io/advisories/technology/red-hat-openshift-container-platform-4-21.md) · [Red Hat OpenShift Container Platform 4.22](https://agentprime.io/advisories/technology/red-hat-openshift-container-platform-4-22.md) · [Red Hat OpenShift Container Platform 5](https://agentprime.io/advisories/technology/red-hat-openshift-container-platform-5.md) - **Published:** 1 Oct 2026 - **Updated:** 30 Oct 2026 - **Reviewed by a person:** No Published by the CVE Program (CNA: redhat) at 1 Oct 2026, 09:17 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. ## Affected products, as the CNA wrote them - Vendor: Red Hat. Product: Red Hat OpenShift Container Platform 4.12. - unaffected: `1792974337 to before *` (rpm) - Other versions: affected - Package name: `openshift4/ose-oauth-proxy` - Collection: `https://catalog.redhat.com/software/containers/` - Vendor: Red Hat. Product: Red Hat OpenShift Container Platform 4.14. - unaffected: `1791837363 to before *` (rpm) - Other versions: affected - Package name: `openshift4/ose-oauth-proxy` - Collection: `https://catalog.redhat.com/software/containers/` - Vendor: Red Hat. Product: Red Hat OpenShift Container Platform 4.15. - unaffected: `1791632336 to before *` (rpm) - Other versions: affected - Package name: `openshift4/ose-oauth-proxy-rhel9` - Collection: `https://catalog.redhat.com/software/containers/` - Vendor: Red Hat. Product: Red Hat OpenShift Container Platform 4.16. - unaffected: `1792878232 to before *` (rpm) - Other versions: affected - Package name: `openshift4/ose-oauth-proxy-rhel9` - Collection: `https://catalog.redhat.com/software/containers/` - Vendor: Red Hat. Product: Red Hat OpenShift Container Platform 4.18. - unaffected: `1790882320 to before *` (rpm) - Other versions: affected - Package name: `openshift4/ose-oauth-proxy-rhel9` - Collection: `https://catalog.redhat.com/software/containers/` - Vendor: Red Hat. Product: Red Hat OpenShift Container Platform 4.19. - unaffected: `1790807096 to before *` (rpm) - Other versions: affected - Package name: `openshift4/ose-oauth-proxy-rhel9` - Collection: `https://catalog.redhat.com/software/containers/` - Vendor: Red Hat. Product: Red Hat OpenShift Container Platform 4.20. - unaffected: `1790704224 to before *` (rpm) - Other versions: affected - Package name: `openshift4/ose-oauth-proxy-rhel9` - Collection: `https://catalog.redhat.com/software/containers/` - Vendor: Red Hat. Product: Red Hat OpenShift Container Platform 4.21. - unaffected: `1790706478 to before *` (rpm) - Other versions: affected - Package name: `openshift4/ose-oauth-proxy-rhel9` - Collection: `https://catalog.redhat.com/software/containers/` - Vendor: Red Hat. Product: Red Hat OpenShift Container Platform 4.22. - unaffected: `1790724885 to before *` (rpm) - Other versions: affected - Package name: `openshift4/ose-oauth-proxy-rhel9` - Collection: `https://catalog.redhat.com/software/containers/` - Vendor: Red Hat. Product: Red Hat OpenShift Container Platform 5. - No versions given - Other versions: unaffected - Package name: `openshift5/ose-oauth-proxy-rhel9` - Collection: `https://access.redhat.com/downloads/content/package-browser/` ## Not analysed yet We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter. ## Severity and exploitation - 6.1 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`, from CNA (redhat) - **CISA KEV:** Not listed. - **EPSS:** 0.0038, the 32nd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days. ## Timeline This record came from the full history of the CVE Program, published 1 Oct 2026. New records show when each source confirmed them. ## Sources - [CVE List: CVE-2026-83589](https://www.cve.org/CVERecord?id=CVE-2026-83589) - [NVD: CVE-2026-83589](https://nvd.nist.gov/vuln/detail/CVE-2026-83589) ### References from the CNA - (vendor-advisory, redhat) - (vendor-advisory, redhat) - (vendor-advisory, redhat) - (vendor-advisory, redhat) - (vendor-advisory, redhat) - (vendor-advisory, redhat) - (vendor-advisory, redhat) - (vendor-advisory, redhat) - (vendor-advisory, redhat) - (vdb-entry, redhat) - (issue-tracking, redhat) Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description. ## Check whether this affects you This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run. - With the agentprime MCP server (), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: - As JSON: - Everything that needs attention now: --- The web page: . Everything for agents: .