Security Advisory WSO2-2023-2735

Published: October 28, 2023

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 : 4.0.0
  • WSO2 Identity Server : 6.1.0 , 6.0.0


A reflected cross site scripting vulnerability.


Due to lack of output encoding, a reflected Cross Site Scripting (XSS) attack can be carried out by injecting a malicious payload into the Authentication Endpoint.


By leveraging the XSS attack, a malicious actor 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:


If you are a WSO2 customer with Support Subscription, please use WSO2 Updates in order to apply the fix.


WSO2 thanks, Adam Kues - Security Researcher at Assetnote for responsibly reporting the identified issue and working with us as we addressed it.