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GHSA-q7hv-xx6h-q2x8

HighCVSS 7.1 / 10
Published Oct 6, 2026·Last modified Oct 6, 2026
Affected Components(1)
Go logogithub.com/external-secrets/external-secrets
0.10.0 – 1.3.2
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)
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Risk Scores
Base Score
7.1

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a low impact on the integrity of the data.

Threat Intelligence
6.5

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
0.24%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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