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CVE-2026-16093: Reliance on Untrusted Inputs in a Security Decision in Red Hat Red Hat Build of Keycloak

0
Medium
VulnerabilityCVE-2026-16093cvecve-2026-16093
Published: 07/17/2026 (07/17/2026, 16:42:52 UTC)
Source: CVE Database V5
Vendor/Project: Red Hat
Product: Red Hat Build of Keycloak

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.

CVSS v3.1

Score 5.4medium

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Technical Details

Data Version
5.2
Assigner Short Name
redhat
Date Reserved
2026-07-17T14:08:34.722Z
Cvss Version
3.1
State
PUBLISHED
Remediation Level
null
Vendor Advisory Urls
[{"url":"https://access.redhat.com/security/cve/CVE-2026-16093","vendor":"Red Hat"}]

Threat ID: 6a5b5eba2d1edb114c7fb77f

Added to database: 07/18/2026, 11:08:42 UTC

Last updated: 07/18/2026, 11:08:50 UTC

Views: 2

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