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Advisory severityHigh7.7Red Hat Linux

High [CVE-2026-66804] Authenticated SSRF via user-controlled towerHost in /ansibletower handler

This high-severity Red Hat Linux advisory covers CVE-2026-66804 affecting multicluster engine for Kubernetes 2.11, multicluster engine for Kubernetes 2.17, multicluster engine for Kubernetes 2.6.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-66804 Source published Source updated

VulniPulse record published Record updated

CVE-2026-66804
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

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Summary

Improper access control in Windows Cross Device Service allows an authorized attacker to elevate privileges locally. A flaw was found in the console component.

An authenticated user can exploit a Server-Side Request Forgery (SSRF) vulnerability by manipulating the `towerHost` parameter when accessing the `/ansibletower` handler. This allows the user to bypass pathname validation and access arbitrary internal or external hosts.

The primary consequence is the exfiltration of full HTTP responses, leading to information disclosure from the affected system. 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).

Weakness: CWE-918.

Affected Red Hat products: multicluster engine for Kubernetes 2.1; multicluster engine for Kubernetes 2.11; multicluster engine for Kubernetes 2.17; multicluster engine for Kubernetes 2.6; multicluster engine for Kubernetes 2.8; multicluster engine for Kubernetes 2.9; 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; Red Hat Advanced Cluster Management for Kubernetes 2.16; Red Hat Advanced Cluster Management for Kubernetes 2.17.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.

Official advisory · high-confidence parse· fetched 28 days ago·verify at source

Fixed versions
  • multicluster-engine/console-mce-rhel9:1787079364
  • multicluster-engine/console-mce-rhel9:1786911977
  • multicluster-engine/console-mce-rhel9:1786668856
  • multicluster-engine/console-mce-rhel9:1787264250
  • multicluster-engine/console-mce-rhel9:1787259048
  • multicluster-engine/console-mce-rhel9:1787079359
  • rhacm2/console-rhel9:1787687062
  • rhacm2/console-rhel9:1787339249
  • rhacm2/console-rhel9:1787339248
  • rhacm2/console-rhel9:1787341780
  • rhacm2/console-rhel9:1786908361
  • rhacm2/console-rhel9:1787335105
  • RHSA-2026:59557
  • RHSA-2026:57194
  • RHSA-2026:59593
  • RHSA-2026:59579
  • RHSA-2026:59558
  • RHSA-2026:59559
  • RHSA-2026:60387
  • RHSA-2026:60390
  • RHSA-2026:60388
  • RHSA-2026:60389
  • RHSA-2026:57191
  • RHSA-2026:60386

Official advisory · high-confidence parse· fetched 28 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • 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.

Official advisory · high-confidence parse· fetched 28 days ago·verify at source

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