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        "dateReserved": "2026-05-28T03:51:03.615Z",
        "datePublished": "2026-05-28T04:37:09.472Z",
        "dateUpdated": "2026-05-29T18:30:05.748Z"
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            "title": "Keycloak: keycloak: brute-force protection bypass in ciba flow",
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                    "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",
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            "descriptions": [
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                    "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."
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                    "vendor": "Red Hat",
                    "product": "Red Hat Build of Keycloak",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "rhbk/keycloak-rhel9",
                    "defaultStatus": "affected",
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                        "cpe:/a:redhat:build_keycloak:"
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                    "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482470",
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            "datePublic": "2026-05-28T03:53:01.734Z",
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                            "cweId": "CWE-305",
                            "description": "Authentication Bypass by Primary Weakness",
                            "lang": "en",
                            "type": "CWE"
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            ],
            "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."
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                {
                    "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."
                }
            ],
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