CVE-2026-49332 (GCVE-0-2026-49332)

Vulnerability from cvelistv5 – Published: 2026-07-28 12:18 – Updated: 2026-08-11 09:50
VLAI
Title
Openshift/oauth-proxy: openshift/oauth-proxy: underscore header smuggling enables identity impersonation on wsgi/php upstreams
Summary
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.
Severity
8.5 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-436 - Interpretation Conflict
Assigner
References
URL Tags
https://access.redhat.com/errata/RHSA-2026:51022 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:51025 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:51038 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-49332 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2483253 issue-trackingx_refsource_REDHAT
Impacted products
Vendor Product Version
Red Hat Red Hat OpenShift Container Platform 4.20 Unaffected: 1785833742 , < * (rpm)
    cpe:/a:redhat:openshift:4.20::el9
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Red Hat Red Hat OpenShift Container Platform 4.21 Unaffected: 1785851359 , < * (rpm)
    cpe:/a:redhat:openshift:4.21::el9
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Red Hat Red Hat OpenShift Container Platform 4.22 Unaffected: 1785885351 , < * (rpm)
    cpe:/a:redhat:openshift:4.22::el9
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Red Hat Red Hat OpenShift Container Platform 4     cpe:/a:redhat:openshift:4
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Date Public
2026-07-28 12:00
Credits
This issue was discovered by Jeremy Choi (Red Hat).
Show details on NVD website
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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