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CVE-2026-0707

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

Published: Jan 8, 2026Updated: Jun 8, 2026 Sources: CVE List NVD GHSACWE-551
5.3MEDIUM
NVD MITRE
EPSS Score
0.4%
Top 69.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Workaround Only
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-551

Affected Products

Red Hat
commercial·US
Red Hat build of Keycloak 26.4On-premWeb App
Web & CMS Plugins
Red Hat build of Keycloak 26.4.10On-premWeb App
Security Products / identity-access-mgmt
Maven
package-ecosystem
org.keycloak:keycloak-parent
OSS Libraries

Exploitability

Workaround Available
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References

https://access.redhat.com/errata/RHSA-2026:3947
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:3948
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-0707
access.redhat.com
and 4 more references View all →

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