9.3 CVE-2026-66794

Enriched by CISA
 

A flaw was found in the `cluster-proxy-addon` component of Multicluster Engine for Kubernetes. This vulnerability allows an unauthenticated attacker, who can access the user-facing route, to bypass authentication and authorization checks. By manipulating URL path segments, the attacker can proxy requests to arbitrary services across any managed cluster. This enables unauthorized access to internal services that would otherwise be protected, potentially leading to information disclosure or further compromise of the cluster environment.
https://nvd.nist.gov/vuln/detail/CVE-2026-66794

Categories

CWE-918 : Server-Side Request Forgery (SSRF)
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. Cross Site Port Attack Server-Side Request Forgery Automated static analysis, commonly referred to as Static Application Security Testing (SAST), can find some instances of this weakness by analyzing source code (or binary/compiled code) without having to execute it. Typically, this is done by building a model of data flow and control flow, then searching for potentially-vulnerable patterns that connect "sources" (origins of input) with "sinks" (destinations where the data interacts with external components, a lower layer such as the OS, etc.) SSRF in LLM toolkit accesses arbitrary URLs for images, as exploited in the wild in April 2026 to conduct port scanning [REF-1519] SSRF in LLM application development framework because the URL retriever allows connections to local addresses using a crafted Location header Chain: LLM integration framework has prompt injection(CWE-1427) that allows an attacker to force the service to retrievedata from an arbitrary URL, essentially providing SSRF (CWE-918) andpotentially injecting content into downstream tasks. Server Side Request Forgery (SSRF) in mail server, as exploited in the wild per CISA KEV. Server Side Request Forgery in cloud platform, as exploited in the wild per CISA KEV. Chain: incorrect validation of intended decimal-based IP address format (CWE-1286) enables parsing of octal or hexadecimal formats (CWE-1389), allowing bypass of an SSRF protection mechanism (CWE-918). Web server allows attackers to request a URL from another server, including other ports, which allows proxied scanning. CGI script accepts and retrieves incoming URLs. Web-based mail program allows internal network scanning using a modified POP3 port number. URL-downloading library automatically follows redirects to file:// and scp:// URLs

References


 

AFFECTED (from MITRE)

Vendor Product Versions
Red Hat Multicluster Engine for Kubernetes
    Red Hat Multicluster Engine for Kubernetes
      © 2022 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation.

      CPE

      cpe start end

      REMEDIATION


      EXPLOITS

      Exploit-db.com

      id description date
      No known exploits

      POC Github

      Url
      No known exploits

      Other Nist (github, ...)

      Url
      No known exploits

      CAPEC

      Common Attack Pattern Enumerations and Classifications

      id description severity
      664 Server Side Request Forgery
      		High