---
id: "CVE-2026-79767"
kind: "vulnerability"
aliases: ["CVE-2026-79767", "GHSA-gfjv-gqf2-c888", "GO-2026-6568"]
title: "Gardener: Authorization Bypass via Group Subject Injection in gardener/gardener"
severity: "medium"
cvss: 5.5
epss: 0.00389
exploited: false
status: "open"
category: "package"
products: [{"name": "github.com/gardener/gardener", "fixed": [], "affected": "all versions", "ecosystem": "go"}, {"name": "github.com/gardener/gardener", "fixed": ["1.142.6"], "affected": "< 1.142.6", "ecosystem": "go"}]
ecosystems: ["go"]
tags: ["gardener", "go", "kubernetes", "package"]
not_affected_if: ["default-config"]
published_at: "2026-09-22T20:17:08+00:00"
first_seen_at: "2026-10-23T19:13:08+00:00"
updated_at: "2026-10-23T21:48:47+00:00"
sources: [{"source": "govuln", "url": "https://pkg.go.dev/vuln/GO-2026-6568", "first_seen_at": "2026-10-23T19:13:08+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-79767", "first_seen_at": "2026-10-23T19:13:43+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-79767", "first_seen_at": "2026-10-23T19:35:23+00:00"}]
---

# Gardener: Authorization Bypass via Group Subject Injection in gardener/gardener

Gardener's customverbauthorizer admission plugin checks only User subjects when a project member list changes, so a project administrator without manage-members permission can add Group or ServiceAccount subjects, including system:authenticated. The added subjects can reach project Shoots, Secrets and cloud provider credentials.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- go:github.com/gardener/gardener affected all versions fixed ?
- go:github.com/gardener/gardener affected < 1.142.6 fixed 1.142.6

## Fix

Upgrade the gardener/gardener Go module to 1.142.6, 1.143.3, 1.144.2 or 1.145.0 (whichever matches your release line).

## Timeline

- 2026-10-23T19:13:08+00:00 govuln https://pkg.go.dev/vuln/GO-2026-6568
- 2026-10-23T19:13:43+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-79767
- 2026-10-23T19:35:23+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-79767

## From the sources

Gardener implements the automated management and operation of Kubernetes clusters as a service. Prior to 1.142.6, 1.143.3, 1.144.2, and 1.145.0, the customverbauthorizer admission plugin's mustCheckProjectMembers manage-members check compares changes to User subjects but does not account for Group or ServiceAccount subjects in Project.spec.members. A project administrator who lacks manage-members permission can add arbitrary Group or ServiceAccount subjects, including the system:authenticated Group, and thereby grant broad project access. The resulting access can include Shoots, Secrets, and cloud provider credentials. This issue is fixed in versions 1.142.6, 1.143.3, 1.144.2, and 1.145.0.

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