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Published: 13th May 2020

Severity: High

CVSS Score: 8.5 (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H)


WSO2 API Manager : 3.0.0 or earlier

WSO2 IS as Key Manager : 5.9.0 or earlier

WSO2 Identity Server : 5.9.0 or earlier


A potential authorization bypass vulnerability has been identified in basic autentication flow of the REST APIs.


When there are two users with the same username in both PRIMARY and secondary userstore and when the user uses basic authentication without the userstore domain in the username, authorization check in REST APIs happens without the userstore domain.


The user in the secondary userstore can perform actions with the privileges of the user in the primary userstore.


If you are using an affected product version, it is highly recommended to migrate to the latest released version to receive security fixes.

You may also apply the relevant fixes based on the changes from the public fix: https://github.com/wso2-extensions/identity-carbon-auth-rest/pull/99

Note: If you are a WSO2 customer with Support Subscription, please use WSO2 Update Manager (WUM) updates in order to apply the fix.

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