Is CVE-2026-2603 actively exploited?

No active exploitation of CVE-2026-2603 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-2603 be exploited remotely?

Yes. CVE-2026-2603 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-2603?

CVE-2026-2603 has a CVSS score of 8.1 (HIGH).

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HIGH

CVE-2026-2603

CWE-306Published: March 18, 2026· Updated: Mar 18, 2026

8.1

CVSS v3.1

EPSS:0.17%probability of exploitation in 30 daysPercentile:37.9th

Official 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.

NVD Source

Technical Analysis

CVE-2026-2603 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 8.1.