Vulnerability in Red Hat Advanced Cluster Security 4

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.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-103314?
CVE-2026-103314 is a high-severity vulnerability in Red Hat Advanced Cluster Security 4, classified under Authentication Bypass by Capture-replay. CVSS score: 7.4/10. Published 2026-10-19.
How severe is CVE-2026-103314?
High severity. CVSS v3 base score is 7.4 out of 10.