Security Advisory WSO2-2020-0705

Published: May 13, 2020

Version: 1.0.0

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 the basic authentication 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.

Otherwise, you may apply the relevant fixes to the product based on the public fix(s):


If you are a WSO2 customer with a support subscription, use WSO2 Update Manager(WUM) updates in order to apply the fix to the affected versions.