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{"acknowledgement": "Red Hat would like to thank Guanping Zhang for reporting this issue.", "bugzilla": {"description": "keycloak: Keycloak Authorization Header Parsing Leading to Potential Security Control Bypass", "id": "2427768", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2427768"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N", "status": "draft"}, "cwe": "CWE-551", "details": ["A flaw was found in Keycloak. The Keycloak Authorization header parser is overly permissive regarding the formatting of the \"Bearer\" authentication scheme. It accepts non-standard characters (such as tabs) as separators and tolerates case variations that deviate from RFC 6750 specifications."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, configure any front-end security controls, such as Web Application Firewalls (WAFs) or reverse proxies, to strictly validate and normalize the `Authorization` header before forwarding requests to Keycloak. This ensures that only standard Bearer token formats are processed, preventing potential bypasses."}, "name": "CVE-2026-0707", "package_state": [{"cpe": "cpe:/a:redhat:build_keycloak:", "fix_state": "Affected", "package_name": "rhbk/keycloak-rhel9", "product_name": "Red Hat Build of Keycloak"}], "public_date": "2026-01-07T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-0707\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-0707"], "statement": "This vulnerability is rated Moderate for Red Hat because Keycloak's excessive tolerance for non-standard Bearer token formats in the Authorization header can lead to inconsistencies with front-end security controls such as WAFs and proxies. This may enable potential bypass risks, allowing malformed tokens to circumvent intended security policies.", "threat_severity": "Moderate"}

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