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OpenAdvisories
Medium · 4.9 CVE-2026-42876 EUVD-2026-29191GHSA-fq7h-9x26-6j22GO-2026-5377

External Secrets Operator: Privilege escalation with secret overwriting

Published May 11, 2026 · Updated Oct 6, 2026 · Assigned by GitHub_M

Description

External Secrets Operator reads information from a third-party service and automatically injects the values as Kubernetes Secrets. Prior to 2.4.1, a user who only has permission to create ExternalSecret resources can cause the operator to create a Secret that Kubernetes will automatically populate with a long-lived token for the specified service account. This effectively allows the user to impersonate any service account in the namespace without needing direct create permissions on TokenRequest or Secrets of that type. This vulnerability is fixed in 2.4.1.

Affected products

VendorProductAffectedFixed
external-secrets external-secrets < 2.4.1 —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

ReleasePackageFixed inAdvisory
openSUSE Leap 16.0 govulncheck-vulndb 0.0.20260723T184607-160000.1.1 openSUSE-SU-2026:21483-1

Wolfi

ReleasePackageFixed inAdvisory
Wolfi rolling external-secrets-operator-1.1 No fix yet —
Wolfi rolling external-secrets-operator-2.3 2.3.0-r11 —

Affected packages

EcosystemPackageAffectedFixedRecord
Go github.com/external-secrets/external-secrets/apis >= 0.1.0, < 2.4.1 2.4.1 GHSA-fq7h-9x26-6j22
Go github.com/external-secrets/external-secrets/apis all versions — GO-2026-5377

Advisories 1

References