CVE-2026-3872 HIGH

CVE-2026-3872: Keycloak: keycloak: information disclosure due to redirect_uri validation bypass

Vendor Red Hat
Product Red Hat build of Keycloak 26.2.15
Weakness CWE-601 · Open redirect
Published April 2, 2026
Last update June 30, 2026

CVSS base score

7.3/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction Required
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

A flaw was found in Keycloak. This issue allows an attacker, who controls another path on the same web server, to bypass the allowed path in redirect Uniform Resource Identifiers (URIs) that use a wildcard. A successful attack may lead to the theft of an access token, resulting in information disclosure.

Key dates

02Disclosure timeline

April 2, 2026 CVE published
June 30, 2026 Record updated