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VulnerabilityPublished Updated

CVE-2026-103314: Red Hat Advanced Cluster Security · CWE-294

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Authoritative record:CVE-2026-103314· High 7.4

Not known to be exploited · CVSS 7.4 High : patch Red Hat Advanced Cluster Security for Kubernetes 4.10 soon.

Data as of 29 Oct 2026, 22:46 UTC

CVSS 3.1 base score
7.4High
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (redhat)CVSS 3.17.4
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 19 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
Red Hat Advanced Cluster Security for Kubernetes 4.10advanced-cluster-security/rhacs-main-rhel8Affected–Fixed in–
Red Hat Advanced Cluster Security for Kubernetes for IBM Z and LinuxONE 4.11advanced-cluster-security/rhacs-main-rhel9Affected–Fixed in–

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.

References

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