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CVE-2026-66794 is an authentication and authorization bypass vulnerability in the cluster-proxy-addon component of Red Hat Multicluster Engine for Kubernetes. An unauthenticated attacker who can reach the user-facing route can manipulate URL path segments to cause the proxy component to forward requests to arbitrary services across managed clusters. The flaw effectively breaks intended access controls on proxied destinations, allowing requests to internal services that should not be reachable without proper authorization. Because the vulnerable component can be abused as a proxy into cluster-internal services, the issue is classified as CWE-918.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.