CVE-2026-0707
Keycloak: keycloak authorization header parsing leading to potential security control bypass
CVSS Score
5.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-551 |
| Vendor | red hat |
| Product | red hat build of keycloak 26.4 |
| Published | Jan 8, 2026 |
| Last Updated | Mar 6, 2026 |
Stay Ahead of the Next One
Get instant alerts for red hat red hat build of keycloak 26.4
Be the first to know when new medium vulnerabilities affecting red hat red hat build of keycloak 26.4 are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None
Affected Versions
Red Hat / Red Hat build of Keycloak 26.4
All versions affected Red Hat / Red Hat build of Keycloak 26.4
All versions affected Red Hat / Red Hat build of Keycloak 26.4
All versions affected Red Hat / Red Hat build of Keycloak 26.4.10
All versions affected References
Credits
Red Hat would like to thank Guanping Zhang for reporting this issue.