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  4. CVE 2026 18208 keycloak services keycloak services inactive out
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Back to active CVEs
Medium · CVSS 6.5CVE-2026-18208

Keycloak-services: keycloak-services: inactive out-of-audience token introspection leaks signed jwt claimCVE-2026-18208

Answer in brief

CVE-2026-18208 records a Medium severity (CVSS 6.5) vulnerability in Keycloak-services: keycloak-services: inactive out-of-audience token introspection leaks signed jwt claim. 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 4, 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 OIDC token introspection endpoint of the keycloak-services component. Keycloak is an open-source identity and access management solution used to secure modern applications and services. The issue occurs when a confidential client, configured to receive signed JWT introspection responses, attempts to introspect a token issued for a different audience. Although the endpoint correctly identifies the token as inactive for that client, it still returns the full set of token claims within a signed JWT field. This allows an unauthorized client to bypass audience-based restrictions and access sensitive information contained in the token.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • GPUStack: Missing authorization on several cluster and resource endpoints allows cross-user access and cluster takeoverAlso CWE-862
  • GLPI: Unauthorized visibility expansion of knowbase items, reminders and RSS feedsAlso CWE-862
  • VitaFit Cloud API Excessive Data Exposure via relation/search EndpointAlso CWE-862
  • GLPI: Unallowed notifications sendingAlso CWE-862
  • Open edX: Support "manage_course_team" REST API omits the `require_support_permission` gate its sibling support views enforceAlso CWE-862

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-862
Source
CVE List V5
Source checked
Nov 4, 2026
References
2 linked sources
Open source record