Reliance on Untrusted Inputs in a Security Decision Affecting keycloak-services package, versions *


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.3% (23rd percentile)

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  • Snyk IDSNYK-RHEL8-KEYCLOAKSERVICES-18011726
  • published18 Jul 2026
  • disclosed16 Jul 2026

Introduced: 16 Jul 2026

CVE-2026-16093  (opens in a new tab)
CWE-807  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:8 keycloak-services.

NVD Description

Note: Versions mentioned in the description apply only to the upstream keycloak-services package and not the keycloak-services package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

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 Base Scores

version 3.1