How severe is CVE-2026-3047?

CVE-2026-3047 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-3047 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-3047?

CVE-2026-3047 primarily affects Redhat Build Of Keycloak. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-3047?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-3047 have an EU (EUVD) identifier?

Yes. CVE-2026-3047 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9864.

When was CVE-2026-3047 published?

CVE-2026-3047 was published on 2026-03-05 and last updated on 2026-06-30.

CVE-2026-3047

CVE-2026-3047 is a high-severity vulnerability in Redhat Build Of Keycloak with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-305.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9864
Weakness: CWE-305
Affected product: Redhat Build Of Keycloak
Published: 2026-03-05
Last modified: 2026-06-30

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.

Frequently asked questions

What is CVE-2026-3047?: 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.
How severe is CVE-2026-3047?: CVE-2026-3047 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-3047 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-3047?: CVE-2026-3047 primarily affects Redhat Build Of Keycloak. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-3047?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-3047 have an EU (EUVD) identifier?: Yes. CVE-2026-3047 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9864.
When was CVE-2026-3047 published?: CVE-2026-3047 was published on 2026-03-05 and last updated on 2026-06-30.

References

Affected products (6)

cpe:2.3:a:redhat:build_of_keycloak:-:*:*:*:text-only:*:*:*
cpe:2.3:a:redhat:build_of_keycloak:26.2:*:*:*:*:*:*:*
cpe:2.3:a:redhat:build_of_keycloak:26.2.14:*:*:*:*:*:*:*
cpe:2.3:a:redhat:build_of_keycloak:26.4:*:*:*:*:*:*:*
cpe:2.3:a:redhat:build_of_keycloak:26.4.10:*:*:*:*:*:*:*
cpe:2.3:a:redhat:keycloak:-:*:*:*:*:*:*:*

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