CVE-2026-2603

Name: CVE-2026-2603
Creator: NVD / NIST
Published: 2026-03-18T02:16:24.813+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10EPSS 0.40%

Last modified Jun 17, 2026

This CVE is reserved or awaiting analysis. Details will appear once published by NVD.

Description

A flaw was found in Keycloak. A remote attacker could bypass security controls by sending a valid SAML response from an external Identity Provider (IdP) to the Keycloak SAML endpoint for IdP-initiated broker logins. This allows the attacker to complete broker logins even when the SAML Identity Provider is disabled, leading to unauthorized authentication.

Metrics

CVSS 3.1

8.1/10

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

EPSS Probability

0.40%

32.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-306

References

https://access.redhat.com/errata/RHSA-2026:3925
https://access.redhat.com/errata/RHSA-2026:3926
https://access.redhat.com/errata/RHSA-2026:3947
https://access.redhat.com/errata/RHSA-2026:3948
https://access.redhat.com/security/cve/CVE-2026-2603
https://bugzilla.redhat.com/show_bug.cgi?id=2440300
https://bugzilla.redhat.com/show_bug.cgi?id=2440300

Timeline

Published: Mar 18, 2026
Last Modified: Jun 17, 2026
Status: Awaiting Analysis

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Source: NVD / NIST