Keycloak Account Resources user lookup contains broken access control

中 4.3CVE-2026-37981 · BIT-keycloak-2026-37981 · GHSA-933f-rg6j-f46p · 19/05/2026 公開 · 26/10/2026 更新

要点

CVE-2026-37981 は org.keycloak:keycloak-services, build of keycloak (redhat) に影響する深刻度「中」 (CVSS 4.3) の脆弱性です。
今後30日間に悪用される確率（EPSS）：0.37%（全脆弱性の 31.0% より高い）。
対処：26.6.2, 26.4.12 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
org.keycloak:keycloak-services Maven	`≥ 26.5.0, < 26.6.2< 26.4.12`	`26.6.226.4.12`
build of keycloak redhat	`≥ 26.4, < 26.4.12`	`26.4.12`

概要

Keycloak's Account Resources user lookup endpoint allows a remote authenticated user, who owns at least one User-Managed Access (UMA) resource, to enumerate and harvest personally identifiable information (PII) for all realm users. By sending crafted requests with arbitrary usernames or email values, the endpoint returns full profile objects for unrelated users. This leads to broad profile-level information disclosure.

NVD の説明

A flaw was found in Keycloak. A broken access control vulnerability in the Account Resources user lookup endpoint allows a remote authenticated user, who owns at least one User-Managed Access (UMA) resource, to enumerate and harvest personally identifiable information (PII) for all realm users. By sending crafted requests with arbitrary usernames or email values, the endpoint returns full profile objects for unrelated users. This leads to broad profile-level information disclosure.