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  4. CVE 2026 18203 keycloak services keycloak services group policy
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Back to active CVEs
Medium · CVSS 6.5CVE-2026-18203

Keycloak-services: keycloak-services: group policy extendchildren matches sibling group path prefixesCVE-2026-18203

Answer in brief

CVE-2026-18203 records a Medium severity (CVSS 6.5) vulnerability in Keycloak-services: keycloak-services: group policy extendchildren matches sibling group path prefixes. The current sources do not mark it as known exploited. The current feed maps Red Hat/keycloak-services (generic), Red Hat/rhbk-keycloak-rhel9/rhbk-keycloak-rhel9 (generic), Red Hat/rhbk-openshift-rhel9/rhbk-openshift-rhel9 (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jul 31, 2026Updated Aug 31, 2026Source checked Nov 3, 2026First seen by HOL Aug 3, 2026Material review Aug 31, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.5
Exploitation
Not marked as known exploited
Affected software
4 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 6.5. 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 Red Hat/keycloak-services (generic), Red Hat/rhbk-keycloak-rhel9/rhbk-keycloak-rhel9 (generic), Red Hat/rhbk-openshift-rhel9/rhbk-openshift-rhel9 (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:a:redhat:build_of_keycloak:-:*:*:*:-:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/keycloak-servicesgeneric*Not reported
Red Hat/rhbk-keycloak-rhel9/rhbk-keycloak-rhel9generic*Not reported
Red Hat/rhbk-openshift-rhel9/rhbk-openshift-rhel9generic*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/keycloak-services, Red Hat/rhbk-keycloak-rhel9/rhbk-keycloak-rhel9, Red Hat/rhbk-openshift-rhel9/rhbk-openshift-rhel9.
  2. 2Review the reported fix. Source-reported workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Evidence timeline and material changes

  1. Published upstream

    Jul 31, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Aug 31, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 3, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
Upstream source description

A flaw was found in the group policy evaluation logic of Keycloak, an identity and access management solution. When a group policy is set to extend permissions to child groups, the system incorrectly uses a simple text-based prefix check to verify group membership. This allows a user who belongs to a different group with a similar starting name to bypass security checks and gain unauthorized access to administrative functions or protected resources.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Tanium addressed an improper access controls vulnerability in Enforce.Also CWE-863
  • Tanium addressed an improper access controls vulnerability in Discover.Also CWE-863
  • Tanium addressed an improper access controls vulnerability in Discover.Also CWE-863
  • Bake filesystem path entitlements approval can be skipped in some multi-target buildsAlso CWE-863

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-863
Source
CVE List V5
Source checked
Nov 3, 2026
References
2 linked sources
Open source record