Oauth-proxy: open redirect via /\ and /\t bypass in post-login redirect
Priority LOW 27CWE-601Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Spoofing
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-601.
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 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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00384 32nd percentileScored 2026-11-07
Fix Fixed Red Hat: 9 advisories
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Red Hat | Red Hat OpenShift Container Platform 4.12 | — | 1792974337 | Patch available | CNA |
| Red Hat | Red Hat OpenShift Container Platform 4.14 | — | 1791837363 | Patch available | CNA |
| Red Hat | Red Hat OpenShift Container Platform 4.15 | — | 1791632336 | Patch available | CNA |
| Red Hat | Red Hat OpenShift Container Platform 4.16 | — | 1792878232 | Patch available | CNA |
| Red Hat | Red Hat OpenShift Container Platform 4.18 | — | 1790882320 | Patch available | CNA |
| Red Hat | Red Hat OpenShift Container Platform 4.19 | — | 1790807096 | Patch available | CNA |
| Red Hat | Red Hat OpenShift Container Platform 4.20 | — | 1790704224 | Patch available | CNA |
| Red Hat | Red Hat OpenShift Container Platform 4.21 | — | 1790706478 | Patch available | CNA |
| Red Hat | Red Hat OpenShift Container Platform 4.22 | — | 1790724885 | Patch available | CNA |
| Red Hat | Red Hat OpenShift Container Platform 5 | — | — | Not affected | CNA |
- Red Hat OpenShift Container Platform 4.12 VendorRed Hat Affected — Fixed in 1792974337 Patch available CNA
- Red Hat OpenShift Container Platform 4.14 VendorRed Hat Affected — Fixed in 1791837363 Patch available CNA
- Red Hat OpenShift Container Platform 4.15 VendorRed Hat Affected — Fixed in 1791632336 Patch available CNA
- Red Hat OpenShift Container Platform 4.16 VendorRed Hat Affected — Fixed in 1792878232 Patch available CNA
- Red Hat OpenShift Container Platform 4.18 VendorRed Hat Affected — Fixed in 1790882320 Patch available CNA
- Red Hat OpenShift Container Platform 4.19 VendorRed Hat Affected — Fixed in 1790807096 Patch available CNA
- Red Hat OpenShift Container Platform 4.20 VendorRed Hat Affected — Fixed in 1790704224 Patch available CNA
- Red Hat OpenShift Container Platform 4.21 VendorRed Hat Affected — Fixed in 1790706478 Patch available CNA
- Red Hat OpenShift Container Platform 4.22 VendorRed Hat Affected — Fixed in 1790724885 Patch available CNA
- Red Hat OpenShift Container Platform 5 VendorRed Hat Affected — Fixed in — Not affected CNA
CPE names CNA · 10
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:/a:redhat:openshift:4.12::el9 | 4.12 | — | Red Hat |
| cpe:/a:redhat:openshift:4.14::el9 | 4.14 | — | Red Hat |
| cpe:/a:redhat:openshift:4.15::el9 | 4.15 | — | Red Hat |
| cpe:/a:redhat:openshift:4.16::el9 | 4.16 | — | Red Hat |
| cpe:/a:redhat:openshift:4.18::el9 | 4.18 | — | Red Hat |
| cpe:/a:redhat:openshift:4.19::el9 | 4.19 | — | Red Hat |
| cpe:/a:redhat:openshift:4.20::el9 | 4.20 | — | Red Hat |
| cpe:/a:redhat:openshift:4.21::el9 | 4.21 | — | Red Hat |
| cpe:/a:redhat:openshift:4.22::el9 | 4.22 | — | Red Hat |
| cpe:/a:redhat:openshift:5 | 5 | — | Red Hat |
- cpe:/a:redhat:openshift:4.12::el9 Versions 4.12 — ·Red Hat
- cpe:/a:redhat:openshift:4.14::el9 Versions 4.14 — ·Red Hat
- cpe:/a:redhat:openshift:4.15::el9 Versions 4.15 — ·Red Hat
- cpe:/a:redhat:openshift:4.16::el9 Versions 4.16 — ·Red Hat
- cpe:/a:redhat:openshift:4.18::el9 Versions 4.18 — ·Red Hat
- cpe:/a:redhat:openshift:4.19::el9 Versions 4.19 — ·Red Hat
- cpe:/a:redhat:openshift:4.20::el9 Versions 4.20 — ·Red Hat
- cpe:/a:redhat:openshift:4.21::el9 Versions 4.21 — ·Red Hat
- cpe:/a:redhat:openshift:4.22::el9 Versions 4.22 — ·Red Hat
- cpe:/a:redhat:openshift:5 Versions 5 — ·Red Hat
Remediation
Red Hat 9 advisories
- RHSA-2026:90274 Released 2026-10-27 · Red Hat rating ImportantOpenShift Container Platform 4.12.102 bug fix and security update
- Red Hat OpenShift Container Platform 4.12 registry.redhat.io/openshift4/cloud-network-config-controller-rhel8, registry.redhat.io/openshift4/egress-router-cni-rhel8, registry.redhat.io/openshift4/kubevirt-csi-driver-rhel8 +47
- RHSA-2026:89715 Released 2026-10-27 · Red Hat rating ImportantOpenShift Container Platform 4.16.74 bug fix and security update
- Red Hat OpenShift Container Platform 4.16 registry.redhat.io/openshift4/aws-kms-encryption-provider-rhel9, registry.redhat.io/openshift4/azure-kms-encryption-provider-rhel9, registry.redhat.io/openshift4/cloud-network-config-controller-rhel9 +47
- RHSA-2026:82785 Released 2026-10-22 · Red Hat rating ImportantOpenShift Container Platform 4.14.76 bug fix and security update
- Red Hat OpenShift Container Platform 4.14 registry.redhat.io/openshift4/ose-alibaba-cloud-controller-manager-rhel8, registry.redhat.io/openshift4/ose-azure-file-csi-driver-rhel8, registry.redhat.io/openshift4/ose-baremetal-rhel8-operator +9
Show 6 more Red Hat advisories
- RHSA-2026:82813 Released 2026-10-22 · Red Hat rating ImportantOpenShift Container Platform 4.15.70 bug fix and security update
- Red Hat OpenShift Container Platform 4.15 registry.redhat.io/openshift4/kube-metrics-server-rhel8, registry.redhat.io/openshift4/ose-agent-installer-node-agent-rhel9, registry.redhat.io/openshift4/ose-alibaba-cloud-controller-manager-rhel9 +23
- RHSA-2026:79039 Released 2026-10-15 · Red Hat rating ImportantOpenShift Container Platform 4.18.57 bug fix and security update
- Red Hat OpenShift Container Platform 4.18 registry.redhat.io/openshift4/frr-rhel9, registry.redhat.io/openshift4/oc-mirror-plugin-rhel9, registry.redhat.io/openshift4/ose-agent-installer-node-agent-rhel9 +18
- RHSA-2026:79169 Released 2026-10-15 · Red Hat rating ImportantOpenShift Container Platform 4.19.51 bug fix and security update
- Red Hat OpenShift Container Platform 4.19 registry.redhat.io/openshift4/ose-azure-cloud-node-manager-rhel9, registry.redhat.io/openshift4/ose-cli-rhel9, registry.redhat.io/openshift4/ose-cluster-csi-snapshot-controller-rhel9-operator +4
- RHSA-2026:74380 Released 2026-10-06 · Red Hat rating ImportantOpenShift Container Platform 4.20.41 bug fix and security update
- Red Hat OpenShift Container Platform 4.20 registry.redhat.io/openshift4/frr-rhel9, registry.redhat.io/openshift4/oc-mirror-plugin-rhel9, registry.redhat.io/openshift4/ose-agent-installer-ui-rhel9 +12
- RHSA-2026:74429 Released 2026-10-06 · Red Hat rating ImportantOpenShift Container Platform 4.22.17 bug fix and security update
- Red Hat OpenShift Container Platform 4.22 registry.redhat.io/openshift4/oc-mirror-plugin-rhel9, registry.redhat.io/openshift4/ose-agent-installer-ui-rhel9, registry.redhat.io/openshift4/ose-aws-cluster-api-controllers-rhel9 +15
- RHSA-2026:74383 Released 2026-10-06 · Red Hat rating ImportantOpenShift Container Platform 4.21.36 bug fix and security update
- Red Hat OpenShift Container Platform 4.21 registry.redhat.io/openshift4/frr-rhel9, registry.redhat.io/openshift4/oc-mirror-plugin-rhel9, registry.redhat.io/openshift4/ose-agent-installer-ui-rhel9 +12
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat OpenShift Container Platform 4.12 | Fixed | RHSA-2026:90274 |
| Red Hat OpenShift Container Platform 4.14 | Fixed | RHSA-2026:82785 |
| Red Hat OpenShift Container Platform 4.15 | Fixed | RHSA-2026:82813 |
| Red Hat OpenShift Container Platform 4.16 | Fixed | RHSA-2026:89715 |
| Red Hat OpenShift Container Platform 4.18 | Fixed | RHSA-2026:79039 |
| Red Hat OpenShift Container Platform 4.19 | Fixed | RHSA-2026:79169 |
| Red Hat OpenShift Container Platform 4.20 | Fixed | RHSA-2026:74380 |
| Red Hat OpenShift Container Platform 4.21 | Fixed | RHSA-2026:74383 |
| Red Hat OpenShift Container Platform 4.22 | Fixed | RHSA-2026:74429 |
Not affected: 10 products
- Red Hat OpenShift Container Platform 4.12
- Red Hat OpenShift Container Platform 4.14
- Red Hat OpenShift Container Platform 4.15
- Red Hat OpenShift Container Platform 4.16
- Red Hat OpenShift Container Platform 4.18
- Red Hat OpenShift Container Platform 4.19
- Red Hat OpenShift Container Platform 4.20
- Red Hat OpenShift Container Platform 4.21
- Red Hat OpenShift Container Platform 4.22
- Red Hat OpenShift Container Platform 5
Timeline
- 2026-10-02 Threatist record created from CVE-2026-83589
- 2026-10-03 Alias added: GHSA-8c7h-7vm9-jhj3
- 2026-10-06 Fix available: RHSA-2026:74429 · Red Hat
- 2026-10-06 Fix available: RHSA-2026:74383 · Red Hat
- 2026-10-06 Fix available: Red Hat OpenShift Container Platform 4.21, Red Hat OpenShift Container Platform 4.22 · Red Hat
- 2026-10-06 Fix available: openshift4/ose-oauth-proxy-rhel9@1790706478, openshift4/ose-oauth-proxy-rhel9@1790724885 · CNA
- 2026-10-06 2 new references · CNA
- 2026-10-07 Fix available: openshift4/ose-oauth-proxy-rhel9@1790704224 · CNA
- 2026-10-07 1 new reference · CNA
- 2026-10-07 Fix available: RHSA-2026:74380 · Red Hat
- 2026-10-07 Fix available: Red Hat OpenShift Container Platform 4.20 · Red Hat
- 2026-10-15 Fix available: openshift4/ose-oauth-proxy-rhel9@1790807096 · CNA
- 2026-10-15 1 new reference · CNA
- 2026-10-16 Fix available: openshift4/ose-oauth-proxy-rhel9@1790882320 · CNA
- 2026-10-16 1 new reference · CNA
- 2026-10-16 Fix available: RHSA-2026:79169 · Red Hat
- 2026-10-16 Fix available: RHSA-2026:79039 · Red Hat
- 2026-10-16 Fix available: Red Hat OpenShift Container Platform 4.18, Red Hat OpenShift Container Platform 4.19 · Red Hat
- 2026-10-23 Fix available: openshift4/ose-oauth-proxy-rhel9@1791632336, openshift4/ose-oauth-proxy@1791837363 · CNA
- 2026-10-23 2 new references · CNA
- 2026-10-23 Fix available: RHSA-2026:82813 · Red Hat
- 2026-10-23 Fix available: RHSA-2026:82785 · Red Hat
- 2026-10-23 Fix available: Red Hat OpenShift Container Platform 4.14, Red Hat OpenShift Container Platform 4.15 · Red Hat
- 2026-10-29 Fix available: openshift4/ose-oauth-proxy-rhel9@1792878232, openshift4/ose-oauth-proxy@1792974337 · CNA
- 2026-10-29 2 new references · CNA
- 2026-10-29 Fix available: Red Hat OpenShift Container Platform 4.12, Red Hat OpenShift Container Platform 4.16 · Red Hat
- 2026-10-30 Fix available: RHSA-2026:90274 · Red Hat
- 2026-10-30 Fix available: RHSA-2026:89715 · Red Hat
- 2026-10-30 Affected versions changed · CNA
- 2026-10-30 Affected versions changed · Red Hat
References
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Sources
- CVE-2026-83589 · CVE Program
- CVE-2026-83589 · NVD
- FIRST EPSS
- GHSA-8c7h-7vm9-jhj3 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-83589 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences