{"api_version":"1","generated_at":"2026-06-02T10:06:58+00:00","cve":"CVE-2026-37979","urls":{"html":"https://cve.report/CVE-2026-37979","api":"https://cve.report/api/cve/CVE-2026-37979.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-37979","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-37979"},"summary":{"title":"Keycloak: keycloak: information disclosure via oidc token introspection endpoint audience bypass","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.","state":"PUBLISHED","assigner":"redhat","published_at":"2026-05-19 12:16:18","updated_at":"2026-05-20 17:16:21"},"problem_types":["CWE-284","CWE-284 CWE-284 Improper Access Control"],"metrics":[{"version":"3.1","source":"secalert@redhat.com","type":"Secondary","score":"6.5","severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","baseScore":6.5,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE"}},{"version":"3.1","source":"CNA","type":"CVSS","score":"6.5","severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","data":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","version":"3.1"}}],"references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-37979","name":"https://access.redhat.com/security/cve/CVE-2026-37979","refsource":"secalert@redhat.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2455328","name":"https://bugzilla.redhat.com/show_bug.cgi?id=2455328","refsource":"secalert@redhat.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://access.redhat.com/errata/RHSA-2026:19596","name":"https://access.redhat.com/errata/RHSA-2026:19596","refsource":"secalert@redhat.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://access.redhat.com/errata/RHSA-2026:19597","name":"https://access.redhat.com/errata/RHSA-2026:19597","refsource":"secalert@redhat.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-37979","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-37979","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Red Hat","product":"Red Hat build of Keycloak 26.4","version":"unaffected 26.4.12-1 * rpm","platforms":[]},{"source":"CNA","vendor":"Red Hat","product":"Red Hat build of Keycloak 26.4","version":"unaffected 26.4-17 * rpm","platforms":[]},{"source":"CNA","vendor":"Red Hat","product":"Red Hat build of Keycloak 26.4","version":"unaffected 26.4-17 * rpm","platforms":[]},{"source":"CNA","vendor":"Red Hat","product":"Red Hat build of Keycloak 26.4.12","version":"","platforms":[]}],"timeline":[{"source":"CNA","time":"2026-04-06T07:57:53.307Z","lang":"en","value":"Reported to Red Hat."},{"source":"CNA","time":"2026-05-19T00:00:00.000Z","lang":"en","value":"Made public."}],"solutions":[],"workarounds":[{"source":"CNA","title":"","value":"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.","time":"","lang":"en"}],"exploits":[],"credits":[{"source":"CNA","value":"Red Hat would like to thank Herdiyan Adam Putra for reporting this issue.","lang":"en"}],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"37979","cve":"CVE-2026-37979","epss":"0.000120000","percentile":"0.016160000","score_date":"2026-05-27","updated_at":"2026-05-28 00:02:13"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"other":{"content":{"id":"CVE-2026-37979","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","timestamp":"2026-05-19T13:39:36.285295Z","version":"2.0.3"},"type":"ssvc"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-284","description":"CWE-284 Improper Access Control","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-05-19T13:40:07.406Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"collectionURL":"https://catalog.redhat.com/software/containers/","cpes":["cpe:/a:redhat:build_keycloak:26.4::el9"],"defaultStatus":"affected","packageName":"rhbk/keycloak-operator-bundle","product":"Red Hat build of Keycloak 26.4","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"26.4.12-1","versionType":"rpm"}]},{"collectionURL":"https://catalog.redhat.com/software/containers/","cpes":["cpe:/a:redhat:build_keycloak:26.4::el9"],"defaultStatus":"affected","packageName":"rhbk/keycloak-rhel9","product":"Red Hat build of Keycloak 26.4","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"26.4-17","versionType":"rpm"}]},{"collectionURL":"https://catalog.redhat.com/software/containers/","cpes":["cpe:/a:redhat:build_keycloak:26.4::el9"],"defaultStatus":"affected","packageName":"rhbk/keycloak-rhel9-operator","product":"Red Hat build of Keycloak 26.4","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"26.4-17","versionType":"rpm"}]},{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:build_keycloak:26.4::el9"],"defaultStatus":"unaffected","packageName":"rhbk/keycloak-rhel9","product":"Red Hat build of Keycloak 26.4.12","vendor":"Red Hat"}],"credits":[{"lang":"en","value":"Red Hat would like to thank Herdiyan Adam Putra for reporting this issue."}],"datePublic":"2026-05-19T00:00:00.000Z","descriptions":[{"lang":"en","value":"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."}],"metrics":[{"other":{"content":{"namespace":"https://access.redhat.com/security/updates/classification/","value":"Moderate"},"type":"Red Hat severity rating"}},{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","version":"3.1"},"format":"CVSS"}],"providerMetadata":{"dateUpdated":"2026-05-20T16:08:52.747Z","orgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","shortName":"redhat"},"references":[{"name":"RHSA-2026:19596","tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:19596"},{"name":"RHSA-2026:19597","tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:19597"},{"tags":["vdb-entry","x_refsource_REDHAT"],"url":"https://access.redhat.com/security/cve/CVE-2026-37979"},{"name":"RHBZ#2455328","tags":["issue-tracking","x_refsource_REDHAT"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2455328"}],"timeline":[{"lang":"en","time":"2026-04-06T07:57:53.307Z","value":"Reported to Red Hat."},{"lang":"en","time":"2026-05-19T00:00:00.000Z","value":"Made public."}],"title":"Keycloak: keycloak: information disclosure via oidc token introspection endpoint audience bypass","workarounds":[{"lang":"en","value":"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."}],"x_generator":{"engine":"cvelib 1.8.0"}}},"cveMetadata":{"assignerOrgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","assignerShortName":"redhat","cveId":"CVE-2026-37979","datePublished":"2026-05-19T10:52:30.442Z","dateReserved":"2026-04-06T07:48:39.722Z","dateUpdated":"2026-05-20T16:08:52.747Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-19 12:16:18","lastModifiedDate":"2026-05-20 17:16:21","problem_types":["CWE-284","CWE-284 CWE-284 Improper Access Control"],"metrics":{"cvssMetricV31":[{"source":"secalert@redhat.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","baseScore":6.5,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE"},"exploitabilityScore":2.8,"impactScore":3.6}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"37979","Ordinal":"1","Title":"Keycloak: keycloak: information disclosure via oidc token intros","CVE":"CVE-2026-37979","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"37979","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"Keycloak: keycloak: information disclosure via oidc token intros"}]}}}