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CVE-2026-2603

HIGH

8.1

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.

Details CVE

Score CVSS v3.18.1

SeveriteHIGH

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

Vecteur d'attaqueNETWORK

ComplexiteLOW

Privileges requisLOW

Interaction utilisateurNONE

Publie3/18/2026

Derniere modification3/18/2026

Sourcenvd

Observations honeypot0

Faiblesses (CWE)

CWE-306

References

https://access.redhat.com/errata/RHSA-2026:3925(secalert@redhat.com)

https://access.redhat.com/errata/RHSA-2026:3926(secalert@redhat.com)

https://access.redhat.com/errata/RHSA-2026:3947(secalert@redhat.com)

https://access.redhat.com/errata/RHSA-2026:3948(secalert@redhat.com)

https://access.redhat.com/security/cve/CVE-2026-2603(secalert@redhat.com)

https://bugzilla.redhat.com/show_bug.cgi?id=2440300(secalert@redhat.com)

https://bugzilla.redhat.com/show_bug.cgi?id=2440300(134c704f-9b21-4f2e-91b3-4a467353bcc0)

Correlations IOC

Aucune correlation enregistree

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