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Fencer Intel
medium 6.5

CVE-2026-49331 json

Openshift/oauth-proxy: openshift/oauth-proxy: unauthenticated identity header injection on whitelisted paths

published 3mo ago modified 18d ago also EUVD-2026-53393

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 8%
public exploits
0
none known

Summary

A flaw was found in openshift/oauth-proxy. On paths configured to bypass authentication (skip-auth-regex), the proxy forwards client-supplied identity headers (X-Forwarded-User, X-Forwarded-Email, X-Forwarded-Access-Token) to the upstream application without stripping them. An unauthenticated attacker can inject forged identity headers on whitelisted paths.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-49331 updated cvss 6.5

openshift/oauth-proxy: openshift/oauth-proxy: unauthenticated identity header injection on whitelisted paths

  • Red Hat OpenShift Container Platform 4 openshift4/ose-oauth-proxy, openshift4/ose-oauth-proxy-rhel9
    affected: workaround, no fix available “Review and minimize skip-auth-regex configurations. Add middleware in upstream applications to ignore X-Forwarded-User on unauthenticated paths.”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
3mo ago

Exploit prediction

0.19% chance of exploitation in the next 30 days, higher than 8% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected products

  • Red Hat Red Hat OpenShift Container Platform 4

Classification

Weakness
  • CWE-345 Insufficient Verification of Data Authenticity

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.