Answer in brief
CVE-2026-4633 records a Low severity (CVSS 3.7) vulnerability in Keycloak's identity-first login flow exposes user information. The current sources do not mark it as known exploited. The current feed maps org.keycloak:keycloak-services (maven), org.keycloak:keycloak-services (maven), org.keycloak:keycloak-services (maven), org.keycloak:keycloak-services (maven). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 3.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps org.keycloak:keycloak-services (maven), org.keycloak:keycloak-services (maven), org.keycloak:keycloak-services (maven), org.keycloak:keycloak-services (maven). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| org.keycloak:keycloak-servicesmaven | >=26.5.0,<26.6.1 | 26.6.1 |
| org.keycloak:keycloak-servicesmaven | <26.4.12 | 26.4.12 |
| org.keycloak:keycloak-servicesmaven | >=26.5.0 <26.6.1 | 26.6.1 |
| org.keycloak:keycloak-servicesmaven | >=0 <26.4.12 | 26.4.12 |
Published upstream
Mar 23, 2026
Evidence: source:osv:source_dates:source-dates:recordSource modified
Sep 10, 2026
Evidence: source:osv:source_dates:source-dates:recordFirst seen by HOL
Jun 19, 2026
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.
Quoted source text, attributed separately from HOL analysis.