CVE-2026-0707
Keycloak: keycloak authorization header parsing leading to potential security control bypass
- State
- Published
- Severity
- 5.3 Medium
- Published
- Jan 8, 2026
- Updated
- Jun 8, 2026
- Reserved
- Jan 8, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 5.3 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N | redhat |
Weaknesses
- CWE-551 Incorrect Behavior Order: Authorization Before Parsing and Canonicalization
Affected Products
| Product | Versions |
|---|---|
Red Hat build of Keycloak 26.4Red Hat |
|
Red Hat build of Keycloak 26.4Red Hat |
|
Red Hat build of Keycloak 26.4Red Hat |
|
Red Hat build of Keycloak 26.4.10Red Hat |
References
- RHSA-2026:3947vendor-advisory
- RHSA-2026:3948vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-0707vdb-entry
- RHBZ#2427768issue-tracking
- https://github.com/keycloak/keycloak/issues/49433
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