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CVE-2026-46579· NVD / CVE Program· CNA redhat

Openshift/router: openshift/router: mtls client certificate spoofing via unstripped x-ssl-client headers on http frontend

A flaw was found in the OpenShift Router. When a Route has `insecureEdgeTerminationPolicy` set to Allow, the HTTP frontend does not remove `X-SSL-Client-*` headers from incoming requests. This allows an unauthenticated attacker to send plain HTTP requests with crafted `X-SSL-Client-*` headers. As a result, backends relying on these headers for mutual TLS (Transport Layer Security) authentication can be bypassed, enabling the attacker to impersonate client certificate identities.

HighCVSS 7.5 · v3.1—No exploit No fix recorded
Published
May 29, 2026
Updated
Sep 10, 2026
EPSS
0.6% · 48th percentile
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Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.6%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
7.5
CNA · redhat
7.4
0.1 point gap

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

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Affected systems

VendorProduct
redhatopenshift container platform
redhatopenshift router

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • redhat openshift container platform4.0
  • redhat openshift routerall versions

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • Red Hat Red Hat OpenShift Container Platform 4.12

    • 1784323891 and laternot affected · rpm

  • Red Hat Red Hat OpenShift Container Platform 4.13

    • 1784056734 and laternot affected · rpm

  • Red Hat Red Hat OpenShift Container Platform 4.14

    • 1784587649 and laternot affected · rpm

  • Red Hat Red Hat OpenShift Container Platform 4.15

    • 1784580646 and laternot affected · rpm

  • Red Hat Red Hat OpenShift Container Platform 4.16

    • 1784331638 and laternot affected · rpm

  • Red Hat Red Hat OpenShift Container Platform 4.17

    • 1784321465 and laternot affected · rpm

  • Red Hat Red Hat OpenShift Container Platform 4.18

    • 1783719377 and laternot affected · rpm

  • Red Hat Red Hat OpenShift Container Platform 4.19

    • 1783445642 and laternot affected · rpm

  • Red Hat Red Hat OpenShift Container Platform 4.20

    • 1781639027 and laternot affected · rpm

  • Red Hat Red Hat OpenShift Container Platform 4.21

    • 1781552170 and laternot affected · rpm

  • Red Hat Red Hat OpenShift Container Platform 4.22

    • 1781643967 and laternot affected · rpm

Same product

redhat: all records

Other highest-scoring records for the same primary product.

  • CVE-2017-7481Ansible before versions 2.3.1.0 and 2.4.0.0 fails to properly mark lookup-plugin results as unsafe.
    40Plan
  • CVE-2018-1085openshift-ansible before versions 3.9.23, 3.7.46 deploys a misconfigured etcd file that causes the SSL client certificate authentication to
    40Plan
  • CVE-2020-27836A flaw was found in cluster-ingress-operator.
    39Monitor
  • CVE-2019-3899It was found that default configuration of Heketi does not require any authentication potentially exposing the management interface to misus
    39Monitor
  • CVE-2026-54099Windows-machine-config-operator: windows-machine-config-operator: wicd csr extra-organization allows privilege escalation to system:masters
    35Monitor
  • CVE-2026-1784Ose-cluster-ingress-operator: remote code execution through haproxy configuration injection
    35Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

—

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

  • CVE-2026-17844 days apartOse-cluster-ingress-operator: remote code execution through haproxy configuration injection
    35Monitor
  • CVE-2026-429650 days apartOpenshift/router: openshift/router: cloud metadata ssrf via fqdn-typed endpointslice bypasses destination validation
    26Monitor

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
high · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
High
Availability impact
None

Weakness class (CWE)

CWE-287 · Improper Authentication

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

nvd-primary

Root cause

Authentication is added route by route instead of being enforced in one place. When a route added later bypasses the shared middleware, the session check never runs for it.

The bug in code

The whole CWE-287 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
app.use("/admin", requireSession, adminRouter);
// Route added later skips the middlewareapp.post("/admin-api/config", updateConfig);

Fixed

ts
const admin = express.Router();admin.use(requireSession, requireRole("admin"));
admin.post("/config", updateConfig);app.use("/admin", admin);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records