CVE-2026-49332
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.30%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 8.5 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
- EPSS
- 0.30% probability · 23th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-436
- Source
- secalert@redhat.com
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.