Vulnerability in Red Hat Build Of Keycloak 26.4
CVE-2026-0707
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.
EPSS: 0.004 (28.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
Affected products
- Red Hat Build Of Keycloak 26.4 — versions 26.4.10-1, 26.4-12
- Red Hat Build Of Keycloak 26.4.10
Weakness classification (CWE)
References
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
- secalert@redhat.com (x_refsource_REDHAT, vdb-entry)
- secalert@redhat.com (x_refsource_REDHAT, issue-tracking)
- secalert@redhat.com
Frequently asked questions
- What is CVE-2026-0707?
- CVE-2026-0707 is a medium-severity vulnerability in Red Hat Build Of Keycloak 26.4, classified under CWE-551. CVSS score: 5.3/10. Published 2026-01-08.
- How severe is CVE-2026-0707?
- Medium severity. CVSS v3 base score is 5.3 out of 10.