medium5.3
CVE-2026-0707
Keycloak has Incorrect Behavior Order: Authorization Before Parsing and Canonicalization
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| maven | org.keycloak:keycloak-parent | <= 26.5.0 | none recorded |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://access.redhat.com/errata/RHSA-2026:3947
- https://access.redhat.com/errata/RHSA-2026:3948
- https://access.redhat.com/security/cve/CVE-2026-0707
- https://bugzilla.redhat.com/show_bug.cgi?id=2427768
- https://github.com/keycloak/keycloak/issues/49433
- https://github.com/advisories/GHSA-gv94-wp4h-vv8p
- https://nvd.nist.gov/vuln/detail/CVE-2026-0707