An issue was discovered in WSO2 API Manager 2.6.0. A potential Stored Cross-Site Scripting (XSS) vulnerability has been identified in the 'implement phase' of the API Publisher.
https://github.com/cybersecurityworks/Disclosed/issues/23
https://docs.wso2.com/display/Security/Security+Advisory+WSO2-2019-0647
https://cybersecurityworks.com/zerodays/cve-2019-20441-wso2.html