---
id: CVE-2020-8561
aliases:
  - GHSA-74j8-88mm-7496
title: Confused Deputy in Kubernetes
summary: Confused Deputy in Kubernetes
severity: medium
cvss: 4.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N'
vendor: kubernetes
product: k8s.io/kubernetes
ecosystem: go
affected:
  - k8s.io/kubernetes <= 1.22.2
published: '2021-09-21'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T03:49:08.708639983Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-74j8-88mm-7496'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2020-8561'
  - url: 'https://github.com/kubernetes/kubernetes/issues/104720'
  - url: 'https://github.com/kubernetes/kubernetes'
  - url: 'https://groups.google.com/g/kubernetes-security-announce/c/RV2IhwcrQsY'
  - url: 'https://kubernetes.io/blog/2026/05/26/reconciling-unfixed-kubernetes-cves'
  - url: 'https://security.netapp.com/advisory/ntap-20211014-0002'
tags:
  - osv
  - go
epss: 0.021
epssPercentile: 0.80895
ingestedAt: '2026-09-12T03:13:01.762Z'
---

## Overview

A security issue was discovered in Kubernetes where actors that control the responses of MutatingWebhookConfiguration or ValidatingWebhookConfiguration requests are able to redirect kube-apiserver requests to private networks of the apiserver. If that user can view kube-apiserver logs when the log level is set to 10, they can view the redirected responses and headers in the logs.

## Affected packages

- `k8s.io/kubernetes <= 1.22.2`

## Remediation

Refer to the advisory for the patched release.