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Vulnerability · Published Aug 12, 2026 · Assigned by redhat

CVE-2026-66878Multicloud-operators-subscription: multicloud-operators-subscription: fetchchannelreferences honours channel.spec.secretref.namespace enabling cross-namespace secret exfiltration

High 7.7

In plain English

A high-severity authorization bypass via user-controlled key in Red Hat Advanced Cluster Management for Kubernetes 2.11 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities).

Severity (CVSS 3.1)7.7High
Exploit odds (30 days)0.5%top 58.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

A flaw was found in multicloud-operators-subscription. A privileged user, specifically a namespace administrator capable of creating Channel and Subscription resources, can exploit this vulnerability. By manipulating the Channel.Spec.SecretRef.Namespace field, the user can cause the system to copy sensitive Secret contents from other namespaces into their own, leading to information disclosure.

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.11 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.13 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.14 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.15 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 see references

Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

References