All vulnerabilities
CVE-2026-4633GHSA-rhgq-f8x5-j2jc

org.keycloak:keycloak-services: Keycloak's identity-first login flow exposes user information

Red Hat org.keycloak:keycloak-servicesmavenIdentity & access
Open in ThreatlineRecord JSON
CVSS
3.7Low
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.47%Chance of exploitation activity in the next 30 days, higher than 39% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in26.6.1Also 26.4.12GitHub
Published23 Mar 2026Updated 23 Oct 2026CVE List

What fixes it

  • 26.6.1org.keycloak:keycloak-services, mavenGitHub<dependency><groupId>org.keycloak</groupId><artifactId>keycloak-services</artifactId><version>26.6.1</version></dependency>
  • 26.4.12org.keycloak:keycloak-services, mavenGitHub<dependency><groupId>org.keycloak</groupId><artifactId>keycloak-services</artifactId><version>26.4.12</version></dependency>
  • 26.6.1org.keycloak:keycloak-services, MavenOSV<dependency><groupId>org.keycloak</groupId><artifactId>keycloak-services</artifactId><version>26.6.1</version></dependency>
  • 26.4.12org.keycloak:keycloak-services, MavenOSV<dependency><groupId>org.keycloak</groupId><artifactId>keycloak-services</artifactId><version>26.4.12</version></dependency>

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

A flaw was found in Keycloak. A remote attacker can exploit differential error messages during the identity-first login flow when Organizations are enabled. This vulnerability allows an attacker to determine the existence of users, leading to information disclosure through user enumeration.

Text from CVE List

Affected versions 63

  • org.keycloak:keycloak-services, maven>= 26.5.0, < 26.6.1GitHub
  • org.keycloak:keycloak-services, maven< 26.4.12GitHub
  • org.keycloak:keycloak-services, Mavenfrom 26.5.0, fixed in 26.6.1OSV
  • org.keycloak:keycloak-services, Maven26.5.0OSV
  • org.keycloak:keycloak-services, Maven26.5.1OSV
  • org.keycloak:keycloak-services, Maven26.5.2OSV
  • org.keycloak:keycloak-services, Maven26.5.3OSV
  • org.keycloak:keycloak-services, Maven26.5.4OSV
  • org.keycloak:keycloak-services, Maven26.5.5OSV
  • org.keycloak:keycloak-services, Maven26.5.6OSV
  • org.keycloak:keycloak-services, Maven26.5.7OSV
  • org.keycloak:keycloak-services, Maven26.6.0OSV
  • org.keycloak:keycloak-services, Mavenfrom first release, fixed in 26.4.12OSV
  • org.keycloak:keycloak-services, Maven1.0-alpha-1OSV
  • org.keycloak:keycloak-services, Maven1.0-alpha-1-12062013OSV
  • org.keycloak:keycloak-services, Maven1.0-alpha-2OSV
  • org.keycloak:keycloak-services, Maven1.0-alpha-3OSV
  • org.keycloak:keycloak-services, Maven1.0-alpha-4OSV
  • org.keycloak:keycloak-services, Maven1.0-beta-1OSV
  • org.keycloak:keycloak-services, Maven1.0-beta-1-20150521OSV
  • org.keycloak:keycloak-services, Maven1.0-beta-1-20150523OSV
  • org.keycloak:keycloak-services, Maven1.0-beta-2OSV
  • org.keycloak:keycloak-services, Maven1.0-beta-3OSV
  • org.keycloak:keycloak-services, Maven1.0-beta-4OSV
  • org.keycloak:keycloak-services, Maven1.0-finalOSV
  • org.keycloak:keycloak-services, Maven1.0-rc-1OSV
  • org.keycloak:keycloak-services, Maven1.0-rc-2OSV
  • org.keycloak:keycloak-services, Maven1.0.1.FinalOSV
  • org.keycloak:keycloak-services, Maven1.0.2.FinalOSV
  • org.keycloak:keycloak-services, Maven1.0.3.FinalOSV
  • org.keycloak:keycloak-services, Maven1.0.4.FinalOSV
  • org.keycloak:keycloak-services, Maven1.0.5.FinalOSV
  • org.keycloak:keycloak-services, Maven1.1.0.Beta1OSV
  • org.keycloak:keycloak-services, Maven1.1.0.Beta2OSV
  • org.keycloak:keycloak-services, Maven1.1.0.FinalOSV
  • org.keycloak:keycloak-services, Maven1.1.1.FinalOSV
  • org.keycloak:keycloak-services, Maven1.2.0.Beta1OSV
  • org.keycloak:keycloak-services, Maven1.2.0.CR1OSV
  • org.keycloak:keycloak-services, Maven1.2.0.FinalOSV
  • org.keycloak:keycloak-services, Maven1.3.0.FinalOSV
  • org.keycloak:keycloak-services, Maven1.3.1.FinalOSV
  • org.keycloak:keycloak-services, Maven1.4.0.FinalOSV
  • org.keycloak:keycloak-services, Maven1.5.0-FinalOSV
  • org.keycloak:keycloak-services, Maven1.5.0.FinalOSV
  • org.keycloak:keycloak-services, Maven1.5.1.FinalOSV
  • org.keycloak:keycloak-services, Maven1.6.0.FinalOSV
  • org.keycloak:keycloak-services, Maven1.6.1.FinalOSV
  • org.keycloak:keycloak-services, Maven1.7.0.CR1OSV
  • org.keycloak:keycloak-services, Maven1.7.0.FinalOSV
  • org.keycloak:keycloak-services, Maven1.8.0.Alpha1OSV
  • org.keycloak:keycloak-services, Maven1.8.0.CR1OSV
  • org.keycloak:keycloak-services, Maven1.8.0.CR2OSV
  • org.keycloak:keycloak-services, Maven1.8.0.CR3OSV
  • org.keycloak:keycloak-services, Maven1.8.0.FinalOSV
  • org.keycloak:keycloak-services, Maven1.8.1.FinalOSV
  • org.keycloak:keycloak-services, Maven1.9.0.CR1OSV
  • org.keycloak:keycloak-services, Maven1.9.0.FinalOSV
  • org.keycloak:keycloak-services, Maven1.9.1.FinalOSV
  • org.keycloak:keycloak-services, Maven1.9.2.FinalOSV
  • org.keycloak:keycloak-services, Maven1.9.3.FinalOSV
  • org.keycloak:keycloak-services, Maven1.9.4.FinalOSV
  • org.keycloak:keycloak-services, Maven1.9.5.FinalOSV
  • org.keycloak:keycloak-services, Maven1.9.7.FinalOSV

References 9