CVE-2026-0707

5.3 MEDIUM

A flaw was found in Keycloak

Published: 2026-01-08 · Last updated: 2026-06-08

Severity and scoring

CVSS: 5.3 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CWE: CWE-551

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.

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-0707
[Other]https://access.redhat.com/errata/RHSA-2026:3947
[Other]https://access.redhat.com/errata/RHSA-2026:3948
[Other]https://access.redhat.com/security/cve/CVE-2026-0707
[Other]https://bugzilla.redhat.com/show_bug.cgi?id=2427768
[Other]https://github.com/keycloak/keycloak/issues/49433

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