CVE-2026-16093

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

17/07/2026

Last modified:

09/08/2026

Description

Keycloak provides a mechanism called Client Policies to enforce security requirements on clients, such as requiring them to use signed JWTs for authentication. A flaw was discovered where this enforcement can be bypassed. An attacker with valid client credentials can provide a fake, unsigned assertion header that tricks the system into thinking the policy requirements have been met. This allows the attacker to authenticate using simpler methods like a client secret even when the administrator has mandated more secure, signed assertions.

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N CVSS v3.1 Severity and Metrics:

Base Score: 5.40 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): Low
Integrity (I): Low
Availability (A): None

Base Score 3.x

5.40

Severity 3.x

MEDIUM

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:redhat:build_of_keycloak:-::::-:::
cpe:2.3:a:redhat:data_grid:8.0:::::::*
cpe:2.3:a:redhat:jboss_enterprise_application_platform_expansion_pack:-:::::::*
cpe:2.3:a:redhat:single_sign-on:7.0:::::::*

To consult the complete list of CPE names with products and versions, see this page

CPE	From	Up to
cpe:2.3:a:redhat:build_of_keycloak:-::::-:::
cpe:2.3:a:redhat:data_grid:8.0:::::::*
cpe:2.3:a:redhat:jboss_enterprise_application_platform_expansion_pack:-:::::::*
cpe:2.3:a:redhat:single_sign-on:7.0:::::::*

CVE-2026-16093

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools