{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-9798","assignerOrgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","state":"PUBLISHED","assignerShortName":"redhat","dateReserved":"2026-05-28T03:51:03.615Z","datePublished":"2026-05-28T04:37:09.472Z","dateUpdated":"2026-05-29T18:30:05.748Z"},"containers":{"cna":{"title":"Keycloak: keycloak: brute-force protection bypass in ciba flow","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":4.3,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N","version":"3.1"},"format":"CVSS"}],"descriptions":[{"lang":"en","value":"A flaw was found in Keycloak, an open-source identity and access management solution. When a user account is temporarily locked due to repeated failed login attempts, an attacker with valid client credentials can exploit the Client-Initiated Backchannel Authentication (CIBA) flow to bypass this brute-force protection. This allows continued authentication attempts and token issuance even when the account should be locked, potentially enabling further unauthorized access attempts."}],"affected":[{"vendor":"Red Hat","product":"Red Hat Build of Keycloak","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"rhbk/keycloak-rhel9","defaultStatus":"affected","cpes":["cpe:/a:redhat:build_keycloak:"]}],"references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-9798","tags":["vdb-entry","x_refsource_REDHAT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2482470","name":"RHBZ#2482470","tags":["issue-tracking","x_refsource_REDHAT"]}],"datePublic":"2026-05-28T03:53:01.734Z","problemTypes":[{"descriptions":[{"cweId":"CWE-305","description":"Authentication Bypass by Primary Weakness","lang":"en","type":"CWE"}]}],"x_redhatCweChain":"CWE-305: Authentication Bypass by Primary Weakness","workarounds":[{"lang":"en","value":"To mitigate this issue, ensure that Client-Initiated Backchannel Authentication (CIBA) is not enabled in Keycloak realms unless explicitly required. If CIBA is enabled, consider disabling it to prevent the bypass of brute-force protection mechanisms. Consult Keycloak documentation for instructions on managing CIBA configuration."}],"timeline":[{"lang":"en","time":"2026-05-28T03:49:51.972Z","value":"Reported to Red Hat."},{"lang":"en","time":"2026-05-28T03:53:01.734Z","value":"Made public."}],"credits":[{"lang":"en","value":"Red Hat would like to thank Evan Hendra (Independent Security Researcher) for reporting this issue."}],"providerMetadata":{"orgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","shortName":"redhat","dateUpdated":"2026-05-28T04:37:09.472Z"},"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-29T18:29:49.249825Z","id":"CVE-2026-9798","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-05-29T18:30:05.748Z"}}]}}