CVE-2026-103314

High

Description

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.

SeverityHigh

CVSS7.4

Exploit probability—

ProductAdvanced Cluster Security 4.10

PublishedOct 19, 2026

First seenOct 19, 2026

Weakness typeCWE-294CWE-294

How to fix

Vendor advisories

access.redhat.com/errata/RHSA-2026:85932
access.redhat.com/errata/RHSA-2026:92342

Affected products

Product	Affected versions	Fixed in
advanced_cluster_security 4.10	No range specified	—
advanced_cluster_security 4.11	No range specified	—

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