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Vulnerabilities

Vulnerability · CVE-2026-3009

A security flaw in the IdentityBrokerService.performLogin endpoint of Keycloak allows authentication to proceed using an Identity Provider (IdP) even after it has been…

Published Mar 5, 2026 · catalog updated Sep 14, 2026 · build of keycloak

Check if you run it

No confirmed exploitation is on record for CVE-2026-3009. EPSS is 0.49%. Act only if a listed version of build of keycloak is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.49%
Remediation
Advisory link
Affected products
cpe redhat/build of keycloak · cpe redhat/jboss enterprise application platform · cpe redhat/jboss enterprise application platform expansion pack · cpe redhat/single sign-on

A security flaw in the IdentityBrokerService.performLogin endpoint of Keycloak allows authentication to proceed using an Identity Provider (IdP) even after it has been disabled by an administrator. An attacker who knows the IdP alias can reuse a previously generated login request to bypass the administrative restriction. This undermines access control enforcement and may allow unauthorized authentication through a disabled external provider.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe redhat/build of keycloak26.4
  • cpe redhat/build of keycloak26.4.10
  • cpe redhat/jboss enterprise application platform8.0
  • cpe redhat/jboss enterprise application platform expansion packversion unspecified
  • cpe redhat/single sign-on7.0

How to fix CVE-2026-3009

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-3009. EPSS is 0.49%. Act only if a listed version of build of keycloak is installed.

Which versions are affected?

Compare what you have installed with redhat/build of keycloak 26.4; redhat/build of keycloak 26.4.10; redhat/jboss enterprise application platform 8.0; redhat/single sign-on 7.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-863: Incorrect Authorization. EPSS 0.49%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 5, 2026 · NIST NVD

    Detected

    A security flaw in the IdentityBrokerService.performLogin endpoint of Keycloak allows authentication to proceed using an Identity Provider (IdP) even after it has been disabled by an administrator. An attacker who knows the IdP alias can reuse a previously generated login request to bypass the administrative restriction. This undermines access control enforcement and may allow unauthorized authent

  2. Sep 14, 2026 · NIST NVD

    Updated

    A security flaw in the IdentityBrokerService.performLogin endpoint of Keycloak allows authentication to proceed using an Identity Provider (IdP) even after it has been disabled by an administrator. An attacker who knows the IdP alias can reuse a previously generated login request to bypass the administrative restriction. This undermines access control enforcement and may allow unauthorized authent

Sources

  • CVE.orgVulnerability recordCVE-2026-3009

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-3009

    30-day exploitation probability 0.5%

    first.org
  • NIST NVDVulnerability recordCVE-2026-3009

    A security flaw in the IdentityBrokerService.performLogin endpoint of Keycloak allows authentication to proceed using an Identity Provider (IdP) even after it has been disabled by an administrator. An attacker who knows the IdP alias can reuse a previously generated login request

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.