CVE-2026-3047 Keycloak SAML Broken has Authentication Bypass by Primary Weakness
Attackers can bypass authentication restrictions by exploiting disabled SAML clients configured as IdP-initiated brokers to establish unauthorized SSO sessions.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-3047?
CVE-2026-3047 is a high-severity authentication bypass vulnerability in Redhat Build of Keycloak, published on 5 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-305
Which versions are affected by CVE-2026-3047?
3 open source packages ship an affected version, including org.keycloak:keycloak-broker-saml and keycloak. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
org.keycloak:keycloak-broker-saml Maven | All versions to 1.8.1.Final | None |
org.keycloak:keycloak-broker-saml Maven | All versions to 1.8.1.Final | None |
keycloak Bitnami | From 26.2.0 | 26.2.1, 26.3.0, 26.4.1, 26.5.0 |
Products include Redhat Build of Keycloak, Redhat Keycloak.
How do I fix CVE-2026-3047?
Apply the vendor's patch.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-3047 being exploited?
There is no known exploitation of CVE-2026-3047 in the wild and no public exploit code.
Other vulnerabilities in Redhat Build of Keycloak
- CVE-2026-15572 Keycloak-services: keycloak-services: dcr protocol mapper type-swap policy bypass allows privilege escalation
- CVE-2026-15573 Keycloak-services: keycloak-services: authorization bypass via unnormalized uri matching in pathmatcher
- CVE-2026-16102 Keycloak-services: keycloak-services: default dcr policy allows role forgery via user property mappers
- CVE-2026-1609 Org.keycloak/keycloak-quarkus-server: keycloak: unauthorized access via jwt authorization grant with disabled users
- CVE-2026-11800 Org.keycloak:keycloak-services: keycloak: authentication bypass via jwt algorithm confusion
Sources
Also known as BIT-keycloak-2026-3047, GHSA-8cr3-vpxx-92cx.