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Back to active CVEs
Medium · CVSS 6.5CVE-2026-37979GHSA-4X37-HW65-52W8

Keycloak: keycloak: information disclosure via oidc token introspection endpoint audience bypassCVE-2026-37979

Answer in brief

CVE-2026-37979 records a Medium severity (CVSS 6.5) vulnerability in Keycloak: keycloak: information disclosure via oidc token introspection endpoint audience bypass. The current sources do not mark it as known exploited. The current feed maps org.keycloak:keycloak-services (maven), 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 May 19, 2026Updated Oct 29, 2026Source checked Oct 29, 2026First seen by HOL Jun 11, 2026Material review Oct 29, 2026
Upstream Advisory

Key facts

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

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 org.keycloak:keycloak-services (maven), org.keycloak:keycloak-services (maven). 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
org.keycloak:keycloak-servicesmaven<26.6.226.6.2
org.keycloak:keycloak-servicesmaven>=0 <26.6.226.6.2

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for org.keycloak:keycloak-services, org.keycloak:keycloak-services.
  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

    May 19, 2026

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

  2. Source modified

    Oct 29, 2026

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

  3. First seen by HOL

    Jun 11, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • NVD vulnerability recordnvd.nist.gov
  • GitHub security advisorygithub.com
Upstream source description

A flaw was found in Keycloak. This access control vulnerability in Keycloak's OpenID Connect (OIDC) token introspection endpoint allows a confidential client to bypass audience restrictions. An attacker-controlled client with valid credentials can retrieve sensitive token claims intended for other resource servers, compromising the confidentiality of lightweight access tokens. This issue can be exploited remotely by any confidential client in the realm with valid credentials.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Cross-user Document Access on Foxit Official Website's HTML-to-PDF ServiceAlso CWE-639

Record context

Vulnerability class
Secret Exfiltration
EPSS
Not reported
CWE IDs
CWE-284, CWE-639
Source
CVE List V5
Source checked
Oct 29, 2026
References
9 linked sources
Open source record