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2 vulnerabilities found for Red Hat Advanced Cluster Security for Kubernetes 4.11 by Red Hat

CVE-2026-103314 (GCVE-0-2026-103314)
Vulnerability from cvelistv5
Published
2026-10-19 12:14
Modified
2026-10-20 21:30
CWE
  • CWE-294 - Authentication Bypass by Capture-replay
Summary
A flaw was found in Red Hat Advanced Cluster Security for Kubernetes (RHACS). The Central SAML authentication ACS endpoint does not retain used SAML assertion or response identifiers to prevent replay. An attacker who obtains a valid, unexpired signed SAML response can submit it multiple times and receive distinct Central authentication tokens for the mapped identity.
References
https://access.redhat.com/errata/RHSA-2026:85932 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-103314 vdb-entry, x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2543879 issue-tracking, x_refsource_REDHAT
Impacted products
Vendor Product Version
Red Hat Red Hat Advanced Cluster Security for Kubernetes 4.11 Unaffected: 1792492060   < *
    cpe:/a:redhat:advanced_cluster_security:4.11::el9
Create a notification for this product.
   Red Hat Red Hat Advanced Cluster Security 4     cpe:/a:redhat:advanced_cluster_security:4
Create a notification for this product.
Show details on NVD website


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          "value": "Until an update is available, restrict network access to the Central SAML ACS endpoint to trusted identity providers and networks, and reduce SAML assertion lifetimes at the identity provider where possible.\n\n--- CME Mitigation Guidance (2026-10-20) ---\nDisclaimer: The following mitigation solutions are provided as a courtesy, pending the application of an official patch. This content was generated utilizing AI tools in conjunction with data from https://cmetaxonomy.org. Customers are advised to independently evaluate and test these temporary mitigations within their own infrastructure.\n\nThe highest-value action is to enforce replay tracking on the Central SAML Assertion Consumer Service endpoint to record and reject previously consumed assertion and response identifiers: upgrade to RHACS 4.11.6 (or the fixed Advanced Cluster Security/Rhacs Main Rhel builds), which record and reject previously consumed SAML response and assertion identifiers at the ACS endpoint, closing all 2 injection vectors (SAML response replay, SAML assertion identifier reuse). Until patched, this is only a concern on RHACS Central deployments on Linux with SAML authentication enabled and a reachable ACS endpoint \u2014 Deployments that do not use SAML authentication or rely on OIDC ID-token logins are unaffected \u2014 so Restrict network access to the Central SAML ACS endpoint to trusted identity providers and networks, and reduce SAML assertion lifetimes at the identity provider. As a compensating measure, Configure host-based firewall rules using firewalld or nftables to restrict reachability to the Central SAML ACS endpoint to authorized identity providers and trusted client subnets and Apply network segmentation via VLANs or subnets to isolate the network path to RHACS Central and restrict reachability to the SAML ACS endpoint. These controls limit blast radius and contain exploitation, but they do not fix the underlying missing SAML replay protection defect \u2014 apply the upstream patch to fully remediate.\n\nHighest-impact CME: CME-202 Host-Based Firewall (firewalld/nftables) (medium)"
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CVE-2026-9165 (GCVE-0-2026-9165)
Vulnerability from cvelistv5
Published
2026-07-06 08:46
Modified
2026-09-08 07:53
CWE
  • CWE-400 - Uncontrolled Resource Consumption
Summary
A flaw was found in Red Hat Advanced Cluster Security for Kubernetes (RHACS). Central does not limit the depth of GraphQL queries served on the authenticated GraphQL API. An authenticated user with a valid API token can send deeply nested queries that cause excessive resource consumption in Central, resulting in a denial of service for the management plane.
References
https://access.redhat.com/errata/RHSA-2026:36207 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36319 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36625 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-9165 vdb-entry, x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2480505 issue-tracking, x_refsource_REDHAT
Impacted products
Vendor Product Version
Red Hat Red Hat Advanced Cluster Security 4.9 Unaffected: 1783357116   < *
    cpe:/a:redhat:advanced_cluster_security:4.9::el8
Create a notification for this product.
   Red Hat Red Hat Advanced Cluster Security for Kubernetes 4.10 Unaffected: 1783357140   < *
    cpe:/a:redhat:advanced_cluster_security:4.10::el8
Create a notification for this product.
   Red Hat Red Hat Advanced Cluster Security for Kubernetes 4.11 Unaffected: 1783352589   < *
    cpe:/a:redhat:advanced_cluster_security:4.11::el9
Create a notification for this product.
   Red Hat Red Hat Advanced Cluster Security 4     cpe:/a:redhat:advanced_cluster_security:4
Create a notification for this product.
Show details on NVD website


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