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

Vulnerability from cvelistv5 – Published: 2026-07-28 12:18 – Updated: 2026-08-12 20:52
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 · CISA-ADP (v2.0.3)
Decision recorded 2026-07-28 13:02 UTC
CWE
  • CWE-436 - Interpretation Conflict
Assigner
References
URL Tags
https://access.redhat.com/errata/RHSA-2026:50681 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:50758 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:51007 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:51013 vendor-advisoryx_refsource_REDHAT
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 4.14 Unaffected: 1785549818 , < * (rpm)
    cpe:/a:redhat:openshift:4.14::el9
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Red Hat Red Hat OpenShift Container Platform 4.16 Unaffected: 1785544039 , < * (rpm)
    cpe:/a:redhat:openshift:4.16::el9
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Red Hat Red Hat OpenShift Container Platform 4.18 Unaffected: 1785529735 , < * (rpm)
    cpe:/a:redhat:openshift:4.18::el9
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Red Hat Red Hat OpenShift Container Platform 4.19 Unaffected: 1785521728 , < * (rpm)
    cpe:/a:redhat:openshift:4.19::el9
 Create a notification for this product.
Red Hat Red Hat OpenShift Container Platform 4.20 Unaffected: 1785833742 , < * (rpm)
    cpe:/a:redhat:openshift:4.20::el9
 Create a notification for this product.
Red Hat Red Hat OpenShift Container Platform 4.21 Unaffected: 1785851359 , < * (rpm)
    cpe:/a:redhat:openshift:4.21::el9
 Create a notification for this product.
Red Hat Red Hat OpenShift Container Platform 4.22 Unaffected: 1785885351 , < * (rpm)
    cpe:/a:redhat:openshift:4.22::el9
 Create a notification for this product.
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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\"collectionURL\": \"https://catalog.redhat.com/software/containers/\", \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:/a:redhat:openshift:4.20::el9\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat OpenShift Container Platform 4.20\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"1785833742\", \"lessThan\": \"*\", \"versionType\": \"rpm\"}], \"packageName\": \"openshift4/ose-oauth-proxy-rhel9\", \"collectionURL\": \"https://catalog.redhat.com/software/containers/\", \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:/a:redhat:openshift:4.21::el9\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat OpenShift Container Platform 4.21\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"1785851359\", \"lessThan\": \"*\", \"versionType\": \"rpm\"}], \"packageName\": \"openshift4/ose-oauth-proxy-rhel9\", \"collectionURL\": \"https://catalog.redhat.com/software/containers/\", \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:/a:redhat:openshift:4.22::el9\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat OpenShift Container Platform 4.22\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"1785885351\", \"lessThan\": \"*\", \"versionType\": \"rpm\"}], \"packageName\": \"openshift4/ose-oauth-proxy-rhel9\", \"collectionURL\": \"https://catalog.redhat.com/software/containers/\", \"defaultStatus\": \"affected\"}], \"timeline\": [{\"lang\": \"en\", \"time\": \"2026-04-17T00:00:00.000Z\", \"value\": \"Reported to Red Hat.\"}, {\"lang\": \"en\", \"time\": \"2026-07-28T12:00:00.000Z\", \"value\": \"Made public.\"}], \"datePublic\": \"2026-07-28T12:00:00.000Z\", \"references\": [{\"url\": \"https://access.redhat.com/errata/RHSA-2026:50681\", \"name\": \"RHSA-2026:50681\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:50758\", \"name\": \"RHSA-2026:50758\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:51007\", \"name\": \"RHSA-2026:51007\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:51013\", \"name\": \"RHSA-2026:51013\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:51022\", \"name\": \"RHSA-2026:51022\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:51025\", \"name\": \"RHSA-2026:51025\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:51038\", \"name\": \"RHSA-2026:51038\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/security/cve/CVE-2026-49332\", \"tags\": [\"vdb-entry\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://bugzilla.redhat.com/show_bug.cgi?id=2483253\", \"name\": \"RHBZ#2483253\", \"tags\": [\"issue-tracking\", \"x_refsource_REDHAT\"]}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"Upstream application hardening: validate X-Forwarded-User against the expected session identity. Reject requests where identity headers do not match the authenticated session.\"}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-436\", \"description\": \"Interpretation Conflict\"}]}], \"providerMetadata\": {\"orgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"shortName\": \"redhat\", \"dateUpdated\": \"2026-08-12T20:52:11.879Z\"}, \"x_redhatCweChain\": \"CWE-436: Interpretation Conflict\"}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-49332\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-12T20:52:11.879Z\", \"dateReserved\": \"2026-05-29T13:28:56.553Z\", \"assignerOrgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"datePublished\": \"2026-07-28T12:18:26.112Z\", \"assignerShortName\": \"redhat\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.





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

Author Source Type Date Other

Nomenclature

  • 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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • 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.


Detection rules are retrieved from Rulezet.