ZDF
Sign inSign up

Vulnerabilities

Security fix · CVE-2026-79767

Gardener: Authorization Bypass via Group Subject Injection

Published Sep 22, 2026 · catalog updated Nov 4, 2026 · Gardener: Authorization Bypass via

Last checked Nov 5, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-79767. EPSS is 0.39%. Act only if a listed version of Gardener: Authorization Bypass via is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Gardener: Authorization Bypass via).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.39%
Remediation
Advisory link
Affected products
Go github.com/gardener/gardener

## Overview The custom verb authorization check in the Gardener API server's admission plugin can be bypassed by adding or subjects to a Project's member list. The check is documented as controlling "human users or groups", but the implementation only gates changes to -kind subjects. A project admin (without permission) can add arbitrary Group subjects - including - granting all authenticated users full project-level access. ## Technical Details The official Gardener documentation at explicitly states: However, the function at compares old and new member lists using , which only tracks subjects where returns true: The function at only matches : Kind: "Group" subjects are NOT matched by , making Group member changes invisible to the authorization check. A project admin without manage-members permission can freely add or remove Group members. ## Steps to reproduce --- _Proof of concept:_ 1. Verify current project membership and confirm the owner has permission: 2. Add a second admin user ( ) to the project WITHOUT the role, then confirm they lack : 3. Verify cannot add a human User member (the check works for Users): 4. Bypass the check by adding a Group subject instead: 5. Verify the Group was added to project members: 6. Demonstrate the impact - any authenticated user now has project access: >_Note: does not exist as a real user. However, the Kubernetes global flag performs user impersonation which is treated as a successfully authenticated request, automatically adding the group. Since was added as a project admin member, this non-existent user now has full admin access to the project including all Shoots, Secrets, and cloud provider credentials._ --- ## Security Impact - Unauthorized access expansion: A project admin can grant project-level access to ANY Kubernetes group, including (all authenticated users) or (all unauthenticated users). ## Patching & Remediation 1. **Fix to include Groups**: The function should match the documented behavior. Change: To:

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Go github.com/gardener/gardener0 → 1.142.6
  • Go github.com/gardener/gardener1.143.0 → 1.143.3
  • Go github.com/gardener/gardener1.144.0 → 1.144.2

How to fix CVE-2026-79767

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-79767. EPSS is 0.39%. Act only if a listed version of Gardener: Authorization Bypass via is installed.

Which versions are affected?

Compare what you have installed with 0 → 1.142.6, 1.143.0 → 1.143.3, 1.144.0 → 1.144.2. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-863: Incorrect Authorization. EPSS 0.39%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 22, 2026 · GitHub Advisory Database

    Detected

    ## Overview The custom verb authorization check in the Gardener API server's admission plugin can be bypassed by adding or subjects to a Project's member list. The check is documented as controlling "human users or groups", but the implementation only gates changes to -kind subjects. A project admin (without permission) can add arbitrary Group subjects - including - granting all authenticated user

  2. Nov 4, 2026 · GitHub Advisory Database

    Fix available

    github.com/gardener/gardener fixed in 1.142.6; github.com/gardener/gardener fixed in 1.143.3; github.com/gardener/gardener fixed in 1.144.2

  3. Nov 4, 2026 · GitHub Advisory Database

    Fix available

    github.com/gardener/gardener fixed in 1.142.6

  4. Nov 4, 2026 · GitHub Advisory Database

    Fix available

    github.com/gardener/gardener fixed in 1.143.3

  5. Nov 4, 2026 · GitHub Advisory Database

    Fix available

    github.com/gardener/gardener fixed in 1.144.2

  6. Nov 4, 2026 · GitHub Advisory Database

    Updated

    ## Overview The custom verb authorization check in the Gardener API server's admission plugin can be bypassed by adding or subjects to a Project's member list. The check is documented as controlling "human users or groups", but the implementation only gates changes to -kind subjects. A project admin (without permission) can add arbitrary Group subjects - including - granting all authenticated user

Sources

  • CVE.orgVulnerability recordCVE-2026-79767

    Official CVE identifier

    cve.org
  • GitHub Advisory DatabasePackage advisoryGHSA-gfjv-gqf2-c888

    GitHub Advisory Database record mirrored by OSV.

    github.com
  • GitLab Advisory DatabasePackage advisorygo/github.com/gardener/gardener/CVE-2026-79767.yml

    ## Overview\nThe custom verb authorization check rbacv1.Subject) bool {\n if subject.Kind == rbacv1.GroupKind {\n return true\n }\n return subject.Kind == rbacv1.UserKind && !strings.HasPrefix(subject.Name, serviceaccount.ServiceAccountUsernamePrefix)\n }\n ```" -date: "2026-09-22" +date: "2026-11-04" pubdate: "2026-09-22" -affected_range: " =1.143.0 =1.144.0 <1.144.2" fixed_version

    gitlab.com
  • Go Vulnerability DatabasePackage advisoryGHSA-gfjv-gqf2-c888

    Gardener: Authorization Bypass via Group Subject Injection

    osv.dev
  • OpenSSF OSV / OSV ScannerPackage advisoryGHSA-gfjv-gqf2-c888

    Gardener: Authorization Bypass via Group Subject Injection

    osv.dev

References

Freshness

Last verified in this catalog Nov 5, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgNov 5, 2026
  • Go Vulnerability DatabaseNov 5, 2026
  • GitLab Advisory DatabaseNov 5, 2026
  • GitHub Advisory DatabaseNov 5, 2026
  • OpenSSF OSV / OSV ScannerNov 5, 2026