Security Advisory WSO2-2020-1106

Published: September 02, 2021

Version: 1.0.0

Severity: High

CVSS Score: 7.4 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L)


  • WSO2 API Manager : 3.1.0 or earlier
  • WSO2 IS as Key Manager : 5.9.0 , 5.10.0


Improper authorization check when accessing API resources.


API Gateway does not properly validate the token scope when accessing a resource with a trailing slash (e.g. "/foo/").


This vulnerability has an impact only if the resource has a trailing slash (e.g. "/foo/"). If such is the case, this allows attackers to bypass the intended access restrictions of the scope protected resources. This could lead to confidentiality, integrity and availability impact on the back-end services, depending on the provided functionalities and the security controls in place.


If the latest version of the affected WSO2 product is not mentioned under the affected product list, you may migrate to the latest 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 Updates in order to apply the fix.