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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.

PUBLISHED Reserved 2026-01-08 | Published 2026-01-08 | Updated 2026-01-08 | Assigner redhat




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

Problem types

Incorrect Behavior Order: Authorization Before Parsing and Canonicalization

Product status

Default status
affected

Timeline

2026-01-08:Reported to Red Hat.
2026-01-07:Made public.

Credits

Red Hat would like to thank Guanping Zhang for reporting this issue.

References

access.redhat.com/security/cve/CVE-2026-0707 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2427768 (RHBZ#2427768) issue-tracking

cve.org (CVE-2026-0707)

nvd.nist.gov (CVE-2026-0707)

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