CVE-2026-4633
Keycloak's identity-first login flow exposes user information
3.7
LOW
CVSS 3.1
EPSS 0.02%
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.
How to fix CVE-2026-4633
To remediate CVE-2026-4633, upgrade the affected package to a fixed version below.
- —upgrade to 26.6.0 or later
Is CVE-2026-4633 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- >= 26.5.0, < 26.6.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | LOW3.7 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N |