CVE-2026-0707: Keycloak has Incorrect Behavior Order: Authorization Before Parsing and Canonicalization

January 8, 2026

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.

References

access.redhat.com/security/cve/CVE-2026-0707
bugzilla.redhat.com/show_bug.cgi?id=2427768
github.com/advisories/GHSA-gv94-wp4h-vv8p
github.com/keycloak/keycloak
nvd.nist.gov/vuln/detail/CVE-2026-0707

Code Behaviors & Features

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