The API Developer Portal 5.2.3 version is still using an old and vulnerable JS libs.
Bootstrap 2.1.0 - unsupported and vulnerabilities (https://endoflife.date/bootstrap)
API Portal 5.2.x
We have mitigated this XSS CVE issue in this bootstrap JS version used in Portal 5.2.3, so there are no know vulnerabilities at the moment. Due to design changes, we cannot upgrade the bootstrap library to a higher version.
In the future, we are working on moving all pages to react and will soon remove this bootstrap JS in a upcoming version of API Developer Portal.