Red Hat Advanced Cluster Security SAML Authentication authentication replay

Summaryinfo

A vulnerability, which was classified as critical, has been found in Red Hat Advanced Cluster Security. This affects an unknown part of the component SAML Authentication. Performing a manipulation results in authentication replay. This vulnerability is known as CVE-2026-103314. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability classified as critical has been found in Red Hat Advanced Cluster Security (affected version unknown). This affects an unknown functionality of the component SAML Authentication. The manipulation with an unknown input leads to a authentication replay vulnerability. CWE is classifying the issue as CWE-294. A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes). This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at access.redhat.com. This vulnerability is uniquely identified as CVE-2026-103314 since 09/30/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 10/19/2026). MITRE ATT&CK project uses the attack technique T1040 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• Red Hat

Name

• Advanced Cluster Security

License

• open-source

Website

• Vendor: https://www.redhat.com/

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