CVE-2023-6291

HIGH7.1EPSS 0.18%

The redirect_uri validation logic allows for bypassing explicitly allowed hosts that would otherwise be restricted

Published: 12/21/2023Modified: 2/16/2024

Description

An issue was found in the redirect_uri validation logic that allows for a bypass of otherwise explicitly allowed hosts. The problem arises in the verifyRedirectUri method, which attempts to enforce rules on user-controllable input, but essentially causes a desynchronization in how Keycloak and browsers interpret URLs. Keycloak, for example, receives "[www%2ekeycloak%2eorg%2fapp%2f:[email protected]](https://www%2ekeycloak%2eorg%2fapp%2f:[email protected]/)" and thinks the authority to be keycloak.org when it is actually example.com. This happens because the validation logic is performed on a URL decoded version, which no longer represents the original input. ### Acknowledgements Karel Knibbe

Affected packages (1)

CVSS scores

SourceVersionSeverityVector
osvCVSS 3.1HIGH7.1CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

References (13)