CVE-2026-4633 Details
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.
A user enumeration vulnerability has been identified in Keycloak. This issue arises when Organizations are enabled and the identity-first login flow is active. A remote attacker can exploit this vulnerability by sending login requests and observing the different error messages returned. Existing users trigger an 'Invalid Password' response, while non-existent users receive an 'Invalid username or password' error. This discrepancy allows attackers to determine the existence of users, leading to unauthorized information disclosure.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 23, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2026-4633 | [email protected] | Vendor Advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=2450247 | [email protected] | ExploitIssue TrackingVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-209 | Generation of Error Message Containing Sensitive Information | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| redhat build of keycloak | All versions |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 1, 2026 | Initial Analysis | [email protected] |
| Mar 23, 2026 | New CVE Received | [email protected] |