CVE-2026-2603HIGH 8.1EPSS p32.1%

CVE-2026-2603CVE-2026-2603

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.

Scoring

CVSS 3.18.1 (HIGH)
VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
EPSS0.40% probability of exploitation · percentile 32.1% · 2026-06-19T12:03:05Z
Published2026-03-18
Last modified2026-03-18

Underlying weaknesses· 1

CWE-306

References

  1. https://access.redhat.com/errata/RHSA-2026:3925
  2. https://access.redhat.com/errata/RHSA-2026:3926
  3. https://access.redhat.com/errata/RHSA-2026:3947
  4. https://access.redhat.com/errata/RHSA-2026:3948
  5. https://access.redhat.com/security/cve/CVE-2026-2603
  6. https://bugzilla.redhat.com/show_bug.cgi?id=2440300
  7. https://bugzilla.redhat.com/show_bug.cgi?id=2440300

1

TypeTargetConfidenceTier
WeaknessMissing Authentication for Critical Functioncwe-3060%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.