CVE-2026-16089 — MEDIUM (5.4)

Vulnerability Description

A flaw was found in the keycloak-services component of Red Hat Build of Keycloak. The issue occurs because OAuth 2.0 authorization codes are not properly bound to the client that originally requested them. An attacker who can intercept an authorization code can modify it to be redeemed by their own client, potentially allowing them to obtain access tokens for a victim's identity.

CVSS Score

5.4

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

LOW

Availability

NONE

Affected Products

Vendor	Product	Versions
Redhat	Build Of Keycloak	-

Related Weaknesses (CWE)

CWE-384

References

https://access.redhat.com/security/cve/CVE-2026-16089Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2501724Issue TrackingVendor Advisory

FAQ

What is CVE-2026-16089?

CVE-2026-16089 is a vulnerability with a CVSS score of 5.4 (MEDIUM). A flaw was found in the keycloak-services component of Red Hat Build of Keycloak. The issue occurs because OAuth 2.0 authorization codes are not properly bound to the client that originally requested ...

How severe is CVE-2026-16089?

CVE-2026-16089 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-16089?

Check the references section above for vendor advisories and patch information. Affected products include: Redhat Build Of Keycloak.