Security Advisory WSO2-2019-0597

Published: July 15, 2019

Severity: Low

CVSS Score: 3.5 (CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N)


  • WSO2 API Manager 2.6.0


A potential Stored Cross-site Scripting (XSS) vulnerability has been identified in the event simulator component.


This vulnerability can be exploited in the file-uploading feature of the event simulator component. An attacker can upload the file in event simulator feature with the malicious script as a file name which leads to an XSS attack.


By leveraging an 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 attack would not be possible.


Apply the following patches based on your product version by following the instructions in the README file. If you have any questions, post them to

Download the relevant patches based on the products you use following the matrix below. Patches can also be downloaded from Security Patch Releases.

Code Product Version Patch
AM WSO2 API Manager 2.6.0 WSO2-CARBON-PATCH-4.4.0-4457


If you are a WSO2 customer with a support subscription, use WSO2 Update Manager (WUM) updates in order to apply the fix. This patch is intended for WSO2 community (free) users.

If you are using newer versions of the products than the ones mentioned in the SOLUTION section, this vulnerability is fixed.


WSO2 thanks, Valentin Giraud ( OKIOK ) for responsibly reporting the identified issue and working with us as we addressed them.