LOWCVSS 3.7EPSS 0.5%

CVE-2026-4633

CVE-2026-4633 updated by NVD

Published: 2026-03-23
Modified: 2026-10-24
EPSS percentile: 40%
Sources: github-advisory, nvd

Summary

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.

Affected packages

Ecosystem	Package	Affected versions	Fixed versions
Maven	org.keycloak:keycloak-services	—	26.6.1, 26.4.12

Remediation: Upgrade to 26.6.1 or later.

References

https://nvd.nist.gov/vuln/detail/CVE-2026-4633

Includes data from the GitHub Advisory Database, licensed under CC-BY 4.0.

Includes data from the National Vulnerability Database (NIST). NVD data is in the public domain; this page is not endorsed by NIST.

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EPSS scores provided by the FIRST.org Exploit Prediction Scoring System.