CVE-2026-66878
CVE-2026-66878: 1 tracked advisory record across Red Hat. Compare vendor sources and published fix guidance.
Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.
Vendor advisory comparison
Red Hat
1 advisory- Advisory severityHigh7.7
High [CVE-2026-66878] FetchChannelReferences honours Channel.spec.secretRef.namespace enabling cross-namespace Secret exfiltration
CVE-2026-66878Source published Source updated
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. This Important flaw in Red Hat Advanced Cluster Management allows a malicious namespace administrator to exfiltrate sensitive Secret data from other namespaces within the cluster. This impacts environments where untrusted namespace administrators have permissions to create Channel and Subscription resources. Red Hat severity: Important — CVSS 7.7 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N).…
- Affected products in this advisory
- Red Hat Advanced Cluster Management for Kubernetes 2.11
- Red Hat Advanced Cluster Management for Kubernetes 2.13
- Red Hat Advanced Cluster Management for Kubernetes 2.14
- Red Hat Advanced Cluster Management for Kubernetes 2.15
2 more entries in the full advisory.
- Source-reported affected versions
- Affected-version details not available in this record.
- Source-reported fixed versions
- rhacm2/multicluster-operators-subscription-rhel9:1787263584
- rhacm2/multicluster-operators-subscription-rhel9:1787263693
- rhacm2/multicluster-operators-subscription-rhel9:1787170830
- rhacm2/multicluster-operators-subscription-rhel9:1787240030
8 more entries in the full advisory.
- Mitigation guidance
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
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