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CVE-2026-0707

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Date: January 7, 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.

Severity Score

Related Resources (5)

https://bugzilla.redhat.com/show_bug.cgi?id=2427768
https://access.redhat.com/security/cve/CVE-2026-0707
https://nvd.nist.gov/vuln/detail/CVE-2026-0707
https://github.com/keycloak/keycloak
https://www.mend.io/vulnerability-database/CVE-2026-0707

Severity Score

Weakness Type (CWE)

Incorrect Behavior Order: Authorization Before Parsing and Canonicalization

CWE-551

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): LOW
Availability (A): NONE

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