CVE-2026-73267 (CVSS 7.7)

Description

A flaw was found in the clusterclaims-controller component of multicluster engine (MCE). A tenant with standard permissions to create and delete ClusterClaim resources can exploit this by manipulating the `spec.namespace` field. This allows the tenant to specify and delete any ManagedCluster, including the hub's local-cluster or other tenants' clusters, due to a missing ownership check. This vulnerability can lead to a denial of service by enabling unauthorized deletion of ManagedClusters.

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CVSS v3.1 Score

7.7

HIGH

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

EPSS — Exploit Prediction

0.0046

Probability of exploitation

0.39%

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-602 CWE-602

References

Other References

https://access.redhat.com/errata/RHSA-2026:59556 https://access.redhat.com/errata/RHSA-2026:59557 https://access.redhat.com/errata/RHSA-2026:59558 https://access.redhat.com/errata/RHSA-2026:59559 https://access.redhat.com/errata/RHSA-2026:59579 https://access.redhat.com/errata/RHSA-2026:59593 https://access.redhat.com/security/cve/CVE-2026-73267 https://bugzilla.redhat.com/show_bug.cgi?id=2514218

Frequently Asked Questions

What is CVE-2026-73267? +

A flaw was found in the clusterclaims-controller component of multicluster engine (MCE). A tenant with standard permissions to create and delete ClusterClaim resources can exploit this by manipulating the `spec.namespace` field. This allows the tenant to specify and delete any ManagedCluster, including the hub's local-cluster or other tenants' clusters, due to a missing ownership check. This vulnerability can lead to a denial of service by enabling unauthorized deletion of ManagedClusters. It has a CVSS v3.1 base score of 7.7 (HIGH).

How severe is CVE-2026-73267? +

CVE-2026-73267 has a CVSS v3.1 score of 7.7 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0046, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-73267? +

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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