Keycloak has Improper Access Control that allows attackers with valid credentials to bypass the allowRemoteResourceManagement=false (CVE-2026-4628) | HOL Guard CVE

Medium · CVSS 4.3CVE-2026-4628GHSA-4PGC-GFRR-WCMG

Keycloak has Improper Access Control that allows attackers with valid credentials to bypass the allowRemoteResourceManagement=false

Answer in brief

CVE-2026-4628 records a Medium severity (CVSS 4.3) vulnerability in Keycloak has Improper Access Control that allows attackers with valid credentials to bypass the allowRemoteResourceManagement=false. The current sources do not mark it as known exploited. The current feed maps 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.

Published Mar 23, 2026Updated Sep 10, 2026Source checked Sep 10, 2026First seen by HOL Sep 10, 2026Material review Sep 10, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 4.3
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 4.3. 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.

Affected scope and exposure questions

The current feed maps org.keycloak:keycloak-services (maven). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
org.keycloak:keycloak-servicesmaven	>=0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for org.keycloak:keycloak-services.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Mar 23, 2026
Evidence: source:osv:source_dates:source-dates:record
Source modified
Sep 10, 2026
Evidence: source:osv:source_dates:source-dates:record
First seen by HOL
Sep 10, 2026

Sources and claim methodology

Upstream source description

A flaw was found in Keycloak. An improper Access Control vulnerability in Keycloak’s User-Managed Access (UMA) resource_set endpoint allows attackers with valid credentials to bypass the allowRemoteResourceManagement=false restriction. This occurs due to incomplete enforcement of access control checks on PUT operations to the resource_set endpoint. This issue enables unauthorized modification of protected resources, impacting data integrity.

Quoted source text, attributed separately from HOL analysis.