CVE 2026 103314

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.

This issue only affects RHACS deployments that have a SAML authentication provider enabled and whose ACS endpoint is reachable by the attacker. An attacker must first obtain a valid signed SAML response before it expires. Deployments that do not use SAML authentication are not affected. The OIDC ID-token login path already includes replay protection.

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.

Bugzilla 2543879 : stackrox: stackrox: SAML response replay allows multiple Central authentication tokens

CWE-294 : Authentication Bypass by Capture-replay

Common Vulnerability Scoring System (CVSS) Score Details

Info alert: Important note

CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications ).

The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 Score Breakdown

Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Understanding the Weakness (CWE)

Technical Impact: Gain Privileges or Assume Identity

Messages sent with a capture-relay attack allow access to resources which are not otherwise accessible without proper authentication.

Red Hat would like to thank Austin Chu (U.C. Berkeley), Corban Villa (U.C. Berkeley), and Sohee Kim (U.C. Berkeley) for reporting this issue.

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