There is a Cross-site Scripting vulnerability in Esri Portal Sites in versions 10.8.1 – 11.1 that may allow a remote, authenticated attacker to create a crafted link which when clicked could potentially execute arbitrary JavaScript code in the victims browser.  The privileges required to execute this attack are high.

References

• https://nvd.nist.gov/vuln/detail/CVE-2023-25835
• https://www.esri.com/arcgis-blog/products/trust-arcgis/administration/portal-for-arcgis-enterprise-sites-security-patch-is-now-available