Security Advisory WSO2-2020-1233

Published: September 02, 2021

Version: 1.0.0

Severity: Medium

CVSS Score: 6.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N)


  • WSO2 API Manager : 3.1.0 , 3.2.0
  • WSO2 IS as Key Manager : 5.10.0
  • WSO2 Identity Server : 5.10.0


Reflected Cross-Site Scripting (XSS) vulnerability in the Authentication Endpoint.


Reflected XSS vulnerability can be exploited by tampering a request parameter in Authentication Endpoint. This can be performed in both authenticated and unauthenticated requests.


By leveraging the XSS attack, an attacker can make the browser get redirected to a malicious website, make changes in the UI of the web page, retrieve information from the browser or harm otherwise. However, since all the session related sensitive cookies are set with httpOnly flag and protected, session hijacking or similar attacks would not be possible.


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.


WSO2 thanks, Rodrigo Duarte Favarini Silva for responsibly reporting the identified issue and working with us as we addressed it.