CVE-2026-49332
Openshift/oauth-proxy: openshift/oauth-proxy: underscore header smuggling enables identity impersonation on wsgi/php upstreams
HIGH 8.5
At a glance
- Source
- NVD
- EPSS
- EPSS 0.53 % · percentile 45 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- redhat
- NVD status
- Awaiting Analysis
Description
A flaw was found in openshift/oauth-proxy. The proxy sets authenticated identity headers using only dash-variant keys (X-Forwarded-User) but does not strip underscore-variant keys (X_Forwarded_User) from incoming requests. WSGI and PHP frameworks normalize both variants to the same variable, allowing an authenticated low-privilege user to smuggle a forged identity that may override the legitimate authenticated identity in the upstream application.
Weaknesses (CWE)
- CWE-436 — Interpretation Conflict
References
- https://access.redhat.com/errata/RHSA-2026:50681
- https://access.redhat.com/errata/RHSA-2026:50758
- https://access.redhat.com/errata/RHSA-2026:51007
- https://access.redhat.com/errata/RHSA-2026:51013
- https://access.redhat.com/errata/RHSA-2026:51022
- https://access.redhat.com/errata/RHSA-2026:51025
- https://access.redhat.com/errata/RHSA-2026:51038
- https://access.redhat.com/errata/RHSA-2026:54188
- https://access.redhat.com/errata/RHSA-2026:54206
- https://access.redhat.com/errata/RHSA-2026:56912
- https://access.redhat.com/errata/RHSA-2026:60023
- https://access.redhat.com/security/cve/CVE-2026-49332
- https://bugzilla.redhat.com/show_bug.cgi?id=2483253
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 8.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N | redhat |
| CVSS 3.1 | HIGH 8.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N | NVD · secalert@redhat.com (Secondary) |
European references
- ENISA EUVD · EUVD-2026-49767
- GCVE · GCVE-0-2026-49332
Affected products
| Product | Versions |
|---|---|
| Red Hat · Red Hat OpenShift Container Platform 4.12 | unaffected 1786458704 < * |
| Red Hat · Red Hat OpenShift Container Platform 4.13 | unaffected 1786477436 < * |
| Red Hat · Red Hat OpenShift Container Platform 4.14 | unaffected 1785549818 < * |
| Red Hat · Red Hat OpenShift Container Platform 4.15 | unaffected 1787054100 < * |
| Red Hat · Red Hat OpenShift Container Platform 4.16 | unaffected 1785544039 < * |
| Red Hat · Red Hat OpenShift Container Platform 4.17 | unaffected 1787543313 < * |
| Red Hat · Red Hat OpenShift Container Platform 4.18 | unaffected 1785529735 < * |
| Red Hat · Red Hat OpenShift Container Platform 4.19 | unaffected 1785521728 < * |
| Red Hat · Red Hat OpenShift Container Platform 4.20 | unaffected 1785833742 < * |
| Red Hat · Red Hat OpenShift Container Platform 4.21 | unaffected 1785851359 < * |
| Red Hat · Red Hat OpenShift Container Platform 4.22 | unaffected 1785885351 < * |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |