Authorization Flaw in org.keycloak:keycloak-services (CVE-2021-4133)
Summary
Vulnerability in org.keycloak:keycloak-services (CVE-2021-4133). Successful exploitation can lead to full system takeover. Mitigation: upgrade to 15.1.1 or later.
Original description
The description as published by the source.
A flaw was found in Keycloak in versions from 12.0.0 and before 15.1.1 which allows an attacker with any existing user account to create new default user accounts via the administrative REST API even when new user registration is disabled.
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2021-4133 has been found in org.keycloak:keycloak-services.
Successful exploitation can lead to full system takeover.
What to do: upgrade org.keycloak:keycloak-services to 15.1.1 or later.
If unsure, ask your IT team or search "org.keycloak:keycloak-services CVE-2021-4133" on the vendor's site.
CVE-2021-4133 (org.keycloak:keycloak-services) — CWE-863
Attack vector: remote (network-reachable) / no user interaction
Patched: 15.1.1 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Incorrect authorization (CWE-863) exists in org.keycloak:keycloak-services.
Check the vendor advisory for the affected versions of org.keycloak:keycloak-services.
Severity: ?. Successful exploitation can lead to full system takeover.
Update to 15.1.1.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで org.keycloak:keycloak-services を使っているサービスとバージョンを洗い出す。
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2Apply patch patch
Upgrade org.keycloak:keycloak-services to 15.1.1ステージング環境で 15.1.1 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
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3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory github.com
- advisory nvd.nist.gov
- advisory github.com
- package github.com
- report bugzilla.redhat.com
- web oracle.com