CVE-2026-0707CWE-551

Keycloak: keycloak authorization header parsing leading to potential security control bypass

Medium · published January 8, 2026

CVSS v3.1
5.3
EPSS
0%
Percentile
33.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00403 · 33.4th percentile
Weakness
CWE-551 · Incorrect Behavior Order: Authorization Before Parsing and Canonicalization
Published
2026-01-08T03:41Z
EPSS history
Timeline
  • 08 JAN 03:41Z
    Keycloak: keycloak authorization header parsing leading to potential security control bypass
    cvelistv5