{"id":"CVE-2023-6544","state":"PUBLISHED","title":"Keycloak: authorization bypass","description":"A flaw was found in the Keycloak package. This issue occurs due to a permissive regular expression hardcoded for filtering which allows hosts to register a dynamic client. A malicious user with enough information about the environment could jeopardize an environment with this specific Dynamic Client Registration and TrustedDomain configuration previously unauthorized.","publishedAt":"2024-04-25T15:58:47.204Z","updatedAt":"2025-11-11T15:57:26.470Z","severity":{"score":5.4,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","source":"redhat"},"assigner":"redhat","products":["org.keycloak:keycloak-services","Red Hat Red Hat build of Keycloak 22","Red Hat Red Hat build of Keycloak 22.0.10","Red Hat Red Hat Single Sign-On 7.6 for RHEL 7","Red Hat Red Hat Single Sign-On 7.6 for RHEL 8","Red Hat Red Hat Single Sign-On 7.6 for RHEL 9","Red Hat RHEL-8 based Middleware Containers","Red Hat RHSSO 7.6.8"],"affected":[{"packageName":"org.keycloak:keycloak-services","defaultStatus":"unaffected","versions":[{"version":"22.0.0","status":"affected","lessThan":"22.0.10","versionType":"semver"},{"version":"23.0.0","status":"affected","lessThan":"24.0.3","versionType":"semver"}],"collectionURL":"https://github.com/keycloak/keycloak"},{"vendor":"Red Hat","product":"Red Hat build of Keycloak 22","packageName":"rhbk/keycloak-operator-bundle","defaultStatus":"affected","versions":[{"version":"22.0.10-1","status":"unaffected","lessThan":"*","versionType":"rpm"}],"collectionURL":"https://catalog.redhat.com/software/containers/","cpes":["cpe:/a:redhat:build_keycloak:22::el9"]},{"vendor":"Red Hat","product":"Red Hat build of Keycloak 22","packageName":"rhbk/keycloak-rhel9","defaultStatus":"affected","versions":[{"version":"22-13","status":"unaffected","lessThan":"*","versionType":"rpm"}],"collectionURL":"https://catalog.redhat.com/software/containers/","cpes":["cpe:/a:redhat:build_keycloak:22::el9"]},{"vendor":"Red Hat","product":"Red Hat build of Keycloak 22","packageName":"rhbk/keycloak-rhel9-operator","defaultStatus":"affected","versions":[{"version":"22-16","status":"unaffected","lessThan":"*","versionType":"rpm"}],"collectionURL":"https://catalog.redhat.com/software/containers/","cpes":["cpe:/a:redhat:build_keycloak:22::el9"]},{"vendor":"Red Hat","product":"Red Hat build of Keycloak 22.0.10","packageName":"keycloak-core","defaultStatus":"unaffected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:build_keycloak:22"]},{"vendor":"Red Hat","product":"Red Hat Single Sign-On 7.6 for RHEL 7","packageName":"rh-sso7-keycloak","defaultStatus":"affected","versions":[{"version":"0:18.0.13-1.redhat_00001.1.el7sso","status":"unaffected","lessThan":"*","versionType":"rpm"}],"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:red_hat_single_sign_on:7.6::el7"]},{"vendor":"Red Hat","product":"Red Hat Single Sign-On 7.6 for RHEL 8","packageName":"rh-sso7-keycloak","defaultStatus":"affected","versions":[{"version":"0:18.0.13-1.redhat_00001.1.el8sso","status":"unaffected","lessThan":"*","versionType":"rpm"}],"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:red_hat_single_sign_on:7.6::el8"]},{"vendor":"Red Hat","product":"Red Hat Single Sign-On 7.6 for RHEL 9","packageName":"rh-sso7-keycloak","defaultStatus":"affected","versions":[{"version":"0:18.0.13-1.redhat_00001.1.el9sso","status":"unaffected","lessThan":"*","versionType":"rpm"}],"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:red_hat_single_sign_on:7.6::el9"]},{"vendor":"Red Hat","product":"RHEL-8 based Middleware Containers","packageName":"rh-sso-7/sso76-openshift-rhel8","defaultStatus":"affected","versions":[{"version":"7.6-46","status":"unaffected","lessThan":"*","versionType":"rpm"}],"collectionURL":"https://catalog.redhat.com/software/containers/","cpes":["cpe:/a:redhat:rhosemc:1.0::el8"]},{"vendor":"Red Hat","product":"RHSSO 7.6.8","packageName":"rh-sso7-keycloak","defaultStatus":"unaffected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:red_hat_single_sign_on:7.6"]}],"references":["https://access.redhat.com/errata/RHSA-2024:1860","https://access.redhat.com/errata/RHSA-2024:1861","https://access.redhat.com/errata/RHSA-2024:1862","https://access.redhat.com/errata/RHSA-2024:1864","https://access.redhat.com/errata/RHSA-2024:1866","https://access.redhat.com/errata/RHSA-2024:1867","https://access.redhat.com/errata/RHSA-2024:1868","https://access.redhat.com/security/cve/CVE-2023-6544","https://bugzilla.redhat.com/show_bug.cgi?id=2253116"],"weaknesses":["CWE-625"],"ingestedAt":"2026-10-29T20:06:42.242Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/6xxx/CVE-2023-6544.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-6544","state":"PUBLISHED","datePublished":"2024-04-25T15:58:47.204Z","dateUpdated":"2025-11-11T15:57:26.470Z","assignerShortName":"redhat","assignerOrgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","dateReserved":"2023-12-06T05:42:36.249Z"},"containers":{"cna":{"title":"Keycloak: authorization bypass","descriptions":[{"lang":"en","value":"A flaw was found in the Keycloak package. This issue occurs due to a permissive regular expression hardcoded for filtering which allows hosts to register a dynamic client. A malicious user with enough information about the environment could jeopardize an environment with this specific Dynamic Client Registration and TrustedDomain configuration previously unauthorized."}],"affected":[{"packageName":"org.keycloak:keycloak-services","defaultStatus":"unaffected","versions":[{"version":"22.0.0","status":"affected","lessThan":"22.0.10","versionType":"semver"},{"version":"23.0.0","status":"affected","lessThan":"24.0.3","versionType":"semver"}],"collectionURL":"https://github.com/keycloak/keycloak"},{"vendor":"Red Hat","product":"Red Hat build of Keycloak 22","packageName":"rhbk/keycloak-operator-bundle","defaultStatus":"affected","versions":[{"version":"22.0.10-1","status":"unaffected","lessThan":"*","versionType":"rpm"}],"collectionURL":"https://catalog.redhat.com/software/containers/","cpes":["cpe:/a:redhat:build_keycloak:22::el9"]},{"vendor":"Red Hat","product":"Red Hat build of Keycloak 22","packageName":"rhbk/keycloak-rhel9","defaultStatus":"affected","versions":[{"version":"22-13","status":"unaffected","lessThan":"*","versionType":"rpm"}],"collectionURL":"https://catalog.redhat.com/software/containers/","cpes":["cpe:/a:redhat:build_keycloak:22::el9"]},{"vendor":"Red Hat","product":"Red Hat build of Keycloak 22","packageName":"rhbk/keycloak-rhel9-operator","defaultStatus":"affected","versions":[{"version":"22-16","status":"unaffected","lessThan":"*","versionType":"rpm"}],"collectionURL":"https://catalog.redhat.com/software/containers/","cpes":["cpe:/a:redhat:build_keycloak:22::el9"]},{"vendor":"Red Hat","product":"Red Hat build of Keycloak 22.0.10","packageName":"keycloak-core","defaultStatus":"unaffected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:build_keycloak:22"]},{"vendor":"Red Hat","product":"Red Hat Single Sign-On 7.6 for RHEL 7","packageName":"rh-sso7-keycloak","defaultStatus":"affected","versions":[{"version":"0:18.0.13-1.redhat_00001.1.el7sso","status":"unaffected","lessThan":"*","versionType":"rpm"}],"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:red_hat_single_sign_on:7.6::el7"]},{"vendor":"Red Hat","product":"Red Hat Single Sign-On 7.6 for RHEL 8","packageName":"rh-sso7-keycloak","defaultStatus":"affected","versions":[{"version":"0:18.0.13-1.redhat_00001.1.el8sso","status":"unaffected","lessThan":"*","versionType":"rpm"}],"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:red_hat_single_sign_on:7.6::el8"]},{"vendor":"Red Hat","product":"Red Hat Single Sign-On 7.6 for RHEL 9","packageName":"rh-sso7-keycloak","defaultStatus":"affected","versions":[{"version":"0:18.0.13-1.redhat_00001.1.el9sso","status":"unaffected","lessThan":"*","versionType":"rpm"}],"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:red_hat_single_sign_on:7.6::el9"]},{"vendor":"Red Hat","product":"RHEL-8 based Middleware Containers","packageName":"rh-sso-7/sso76-openshift-rhel8","defaultStatus":"affected","versions":[{"version":"7.6-46","status":"unaffected","lessThan":"*","versionType":"rpm"}],"collectionURL":"https://catalog.redhat.com/software/containers/","cpes":["cpe:/a:redhat:rhosemc:1.0::el8"]},{"vendor":"Red Hat","product":"RHSSO 7.6.8","packageName":"rh-sso7-keycloak","defaultStatus":"unaffected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:red_hat_single_sign_on:7.6"]}],"references":[{"url":"https://access.redhat.com/errata/RHSA-2024:1860","name":"RHSA-2024:1860","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2024:1861","name":"RHSA-2024:1861","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2024:1862","name":"RHSA-2024:1862","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2024:1864","name":"RHSA-2024:1864","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2024:1866","name":"RHSA-2024:1866","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2024:1867","name":"RHSA-2024:1867","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2024:1868","name":"RHSA-2024:1868","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/security/cve/CVE-2023-6544","tags":["vdb-entry","x_refsource_REDHAT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2253116","name":"RHBZ#2253116","tags":["issue-tracking","x_refsource_REDHAT"]}],"metrics":[{"other":{"content":{"value":"Moderate","namespace":"https://access.redhat.com/security/updates/classification/"},"type":"Red Hat severity rating"}},{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.4,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","version":"3.1"},"format":"CVSS"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-625","description":"Permissive Regular Expression","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"redhat","orgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","dateUpdated":"2025-11-11T15:57:26.470Z"},"datePublic":"2024-04-16T00:00:00.000Z","x_redhatCweChain":"CWE-625: Permissive Regular Expression","workarounds":[{"lang":"en","value":"No mitigation is currently available for this flaw."}],"timeline":[{"lang":"en","time":"2023-12-06T00:00:00.000Z","value":"Reported to Red Hat."},{"lang":"en","time":"2024-04-16T00:00:00.000Z","value":"Made public."}],"credits":[{"lang":"en","value":"Red Hat would like to thank Bastian Kanbach (Secure Systems DE [bastian.kanbach@securesystems.de]) for reporting this issue."}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2023-6544","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-04-25T19:19:09.097776Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2024-06-04T17:17:10.747Z"}},{"title":"CVE Program Container","references":[{"url":"https://access.redhat.com/errata/RHSA-2024:1860","name":"RHSA-2024:1860","tags":["vendor-advisory","x_refsource_REDHAT","x_transferred"]},{"url":"https://access.redhat.com/errata/RHSA-2024:1861","name":"RHSA-2024:1861","tags":["vendor-advisory","x_refsource_REDHAT","x_transferred"]},{"url":"https://access.redhat.com/errata/RHSA-2024:1862","name":"RHSA-2024:1862","tags":["vendor-advisory","x_refsource_REDHAT","x_transferred"]},{"url":"https://access.redhat.com/errata/RHSA-2024:1864","name":"RHSA-2024:1864","tags":["vendor-advisory","x_refsource_REDHAT","x_transferred"]},{"url":"https://access.redhat.com/errata/RHSA-2024:1866","name":"RHSA-2024:1866","tags":["vendor-advisory","x_refsource_REDHAT","x_transferred"]},{"url":"https://access.redhat.com/errata/RHSA-2024:1867","name":"RHSA-2024:1867","tags":["vendor-advisory","x_refsource_REDHAT","x_transferred"]},{"url":"https://access.redhat.com/errata/RHSA-2024:1868","name":"RHSA-2024:1868","tags":["vendor-advisory","x_refsource_REDHAT","x_transferred"]},{"url":"https://access.redhat.com/security/cve/CVE-2023-6544","tags":["vdb-entry","x_refsource_REDHAT","x_transferred"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2253116","name":"RHBZ#2253116","tags":["issue-tracking","x_refsource_REDHAT","x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-02T08:35:14.454Z"}}]}}}