High [CVE-2026-71467] Authentication bypass on /federated via Upgrade: websocket header spoofing
This high-severity Red Hat Linux advisory covers CVE-2026-71467 affecting Red Hat Advanced Cluster Management for Kubernetes 2.17.
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Summary
A flaw was found in search-v2-api. The authentication middleware in the affected component unconditionally skips authentication when a request includes an `Upgrade: websocket` header.
An unauthenticated attacker can exploit this by sending a specially crafted HTTP POST request to the `/federated` endpoint with the `Upgrade: websocket` header. This allows the attacker to bypass authentication and access federated search results across all configured remote managed hubs, leading to information disclosure.
This is an Important flaw in Red Hat Advanced Cluster Management for Kubernetes. An unauthenticated attacker can bypass authentication by spoofing a WebSocket upgrade header when the `FEATURE_FEDERATED_SEARCH` is enabled, which is the default for Global Hub deployments.
Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N). Weakness: CWE-287.
Red Hat fixing advisory: RHSA-2026:60386.
Affected product named by the advisory: 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 29 days ago·verify at source
- rhacm2/acm-search-v2-api-rhel9:1787229541
- RHSA-2026:60386
Official advisory · high-confidence parse· fetched 29 days ago·verify at source
Mitigation checklist
- To mitigate this vulnerability, ensure the `FEATURE_FEDERATED_SEARCH` is disabled if not actively used. This feature is off by default in standard deployments of Red Hat Advanced Cluster Management for Kubernetes. For Global Hub deployments where `FEATURE_FEDERATED_SEARCH` is enabled by default, consider restricting network access to the `search-v2-api`'s `/federated` endpoint to trusted clients.
Official advisory · high-confidence parse· fetched 29 days ago·verify at source
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