CVE-2026-45726: Information Disclosure (CVSS 7.6)

Description

Omni manages Kubernetes on bare metal, virtual machines, or in a cloud. From 1.3.0 until 1.6.6 and 1.7.3, importing a standalone Talos cluster creates an ImportedClusterSecrets resource containing the cluster's complete CA secrets bundle. The access rules in internal/backend/runtime/omni/state_access.go allow an authenticated user with the Reader role to retrieve the resource through ResourceService if the importing actor has not rotated those secrets, exposing Kubernetes, Talos, and etcd CA private keys plus the service-account key. The Kubernetes CA private key permits certificate signing for privileged identities such as system:masters and provides control of the imported cluster outside Omni's authorization boundary, including its workloads, credentials, and secrets. This issue is fixed in versions 1.6.6 and 1.7.3.

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CVSS v3.1 Score

7.6

HIGH

CVSS:3.1/AV:A/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0014

Probability of exploitation

0.03%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-200 CWE-200

CWE-522 CWE-522

CWE-732 CWE-732

References

Other References

https://github.com/siderolabs/omni/commit/25fa9e141ee00285e70210ed40d11e4e457c871d https://github.com/siderolabs/omni/commit/a224cb020f3aaca2bc21c3e32a38eb4a37e531e8 https://github.com/siderolabs/omni/commit/b8ca100c4539ea83f0ac2e53dcd523e6e5b68111 https://github.com/siderolabs/omni/pull/2807 https://github.com/siderolabs/omni/releases/tag/v1.6.6 https://github.com/siderolabs/omni/releases/tag/v1.7.3 https://github.com/siderolabs/omni/security/advisories/GHSA-wv8c-6mx2-xf4j

Frequently Asked Questions

What is CVE-2026-45726? +

Omni manages Kubernetes on bare metal, virtual machines, or in a cloud. From 1.3.0 until 1.6.6 and 1.7.3, importing a standalone Talos cluster creates an ImportedClusterSecrets resource containing the cluster's complete CA secrets bundle. The access rules in internal/backend/runtime/omni/state_access.go allow an authenticated user with the Reader role to retrieve the resource through ResourceService if the importing actor has not rotated those secrets, exposing Kubernetes, Talos, and etcd CA private keys plus the service-account key. The Kubernetes CA private key permits certificate signing for privileged identities such as system:masters and provides control of the imported cluster outside Omni's authorization boundary, including its workloads, credentials, and secrets. This issue is fixed in versions 1.6.6 and 1.7.3. It has a CVSS v3.1 base score of 7.6 (HIGH).

How severe is CVE-2026-45726? +

CVE-2026-45726 has a CVSS v3.1 score of 7.6 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0014, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-45726? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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