CVE-2026-3047 — Vulnerability in org.keycloak:keycloak-broker-saml...

HIGH

Keycloak SAML Broken has Authentication Bypass by Primary Weakness

Published March 5, 2026Updated August 26, 2026Source: osv

Summary

A flaw was found in org.keycloak.broker.saml. When a disabled Security Assertion Markup Language (SAML) client is configured as an Identity Provider (IdP)-initiated broker landing target, it can still complete the login process and establish a Single Sign-On (SSO) session. This allows a remote attacker to gain unauthorized access to other enabled clients without re-authentication, effectively bypassing security restrictions. A fix is available at https://github.com/keycloak/keycloak/releases/tag/26.5.5.

Advisory Timeline

First published March 5, 2026 (221 days ago).
Last revised August 26, 2026 — 173 days after initial publication.

Affected Packages (1)

Affects 1 ecosystem: maven (1).

Package	Ecosystem	Affected	Fixed In
org.keycloak:keycloak-broker-saml	maven	1.2.0.Beta1, 1.2.0.CR1, 1.2.0.Final, 1.3.0.Final (+15 more)	Range-based data available

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CWE-305
View on MITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 8.8 score means for each attack dimension.

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

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

References

Frequently Asked Questions

What is CVE-2026-3047?: Keycloak SAML Broken has Authentication Bypass by Primary Weakness This vulnerability has been assigned a severity rating of HIGH (CVSS score: 8.8/10).
How do I check if my project is affected by CVE-2026-3047?: CVE-2026-3047 affects org.keycloak:keycloak-broker-saml. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-3047 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score

8.8

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-8cr3-vpxx-92cx

BIT-keycloak-2026-3047

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