EUVD-2026-18206
GHSA-cjm2-j6cm-6p6m
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
Lifecycle Timeline
4Description
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.
Analysis
Open redirect in Red Hat Build of Keycloak allows authenticated attackers with control over another path on the same web server to bypass wildcard-based redirect URI validation and steal OAuth access tokens. Attack requires low complexity and user interaction (CVSS 7.3). …
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Remediation
Within 24 hours: Inventory all Keycloak deployments and document which instances share web servers with user-controllable or third-party content paths. Within 7 days: Implement strict redirect URI whitelisting (exact matching, not wildcards) and disable any unnecessary path hosting on shared servers; review Keycloak authentication logs for suspicious redirect attempts. …
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External POC / Exploit Code
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