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

January 8, 2026 (updated June 9, 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/errata/RHSA-2026:3947
access.redhat.com/errata/RHSA-2026:3948
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/issues/49433
nvd.nist.gov/vuln/detail/CVE-2026-0707

Code Behaviors & Features

Detect and mitigate CVE-2026-0707 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Dependency Scanning using SBOM also detects vulnerabilities from proprietary advisories that this site does not include. Learn more about Dependency Scanning using SBOM →