🛡️ CVE-2026-16093 — build-of-keycloak

🟡 CVSS 5.4 — Medium ✅ No Known Exploit CWE-807 NVD
5.4
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity low, availability none.

Affected software

CVE-2026-16093 is recorded against 4 packages.

  • build-of-keycloak
  • data-grid
  • jboss-enterprise-application-platform-expansion-pack
  • single-sign-on

Timeline and source

Published on 17 July 2026 and last revised on 9 August 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

access.redhat.com
bugzilla.redhat.com

Details

Severity MEDIUM
CVSS Score 5.4
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CWE CWE-807
Public Exploit ✅ No
Source NVD
Published 2026-07-17
Updated 2026-08-11
Modified 2026-08-09
Fix URL N/A

Affected Packages

Software From version Fixed in
build-of-keycloak — —
data-grid — —
jboss-enterprise-application-platform-expansion-pack — —
single-sign-on — —

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