CVE-2026-0707
Medium
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.
SeverityMedium
CVSS5.3
Exploit probability—
ProductOrg.keycloak:keycloak-parent
PublishedJan 8, 2026
First seenJan 8, 2026
Weakness typeCWE-551CWE-551
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| org.keycloak:keycloak-parentMaven | v ≤ 26.5.0 | — |
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