Kurz gesagt
- CVE-2026-26287 ist eine Schwachstelle (HOCH (CVSS 7.1)) in github.com/external-secrets/external-secrets.
- Wahrscheinlichkeit einer Ausnutzung in den nächsten 30 Tagen (EPSS): 0.24%, höher als bei 15.7% aller Schwachstellen.
- Abhilfe: auf 1.3.2 oder neuer aktualisieren.
Description
Summary
A bug in the webhook generator initialization order incorrectly cleared the label-enforcement flag (EnforceLabels) after it was set, resulting in the provider-side check for external-secrets.io/type=webhook being skipped (and the operation to succeed while it should have failed with secret does not contain needed label 'external-secrets.io/type: webhook'. Update secret label to use it with webhook.
Impact
A user with the permission to create webhook generator can set the webhook generator to a victim' secret (which was not previously labelled for webhook's use), and exfiltrate it to a malicious URL.
Mitigations
Until you upgrade, you can reduce risk by:
- disabling webhook generators if not needed (or denying
generators.external-secrets.io/v1alpha1 Webhook via an admission policy);
- restricting RBAC: limit who can create generators of kind
Webhook;
- enforcing an admission policy (OPA Gatekeeper / Kyverno) requiring referenced secrets to be labeled
external-secrets.io/type=webhook;
- restricting egress from external-secrets controller pods to an allowlist (kubernetes
NetworkPolicy / service mesh egress policy).
References
- PR #5901 (fix: webhook initialization order)
NVD description
External Secrets Operator reads information from a third-party service and automatically injects the values as Kubernetes Secrets. Starting in version 0.10.0 and prior to version 1.3.2, a bug in the `webhook` generator initialization order incorrectly cleared the label-enforcement flag (`EnforceLabels`) after it was set, resulting in the provider-side check for `external-secrets.io/type=webhook` being skipped (and the operation to succeed while it should have failed with `secret does not contain needed label 'external-secrets.io/type: webhook'. Update secret label to use it with webhook`. Version 1.3.2 contains a patch.
Weitere Schwachstellen in github.com/external-secrets/external-secrets
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