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.

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…

EPSS: 0.000 (9.2th 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)

CWE-551

References

RHSA-2026:3947 (vendor-advisory, x_refsource_REDHAT)
RHSA-2026:3948 (vendor-advisory, x_refsource_REDHAT)
access.redhat.com/security/cve/CVE-2026-0707 (vdb-entry, x_refsource_REDHAT)
RHBZ#2427768 (issue-tracking, x_refsource_REDHAT)

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.