Hotfix: Unity Security Update for Cities: Skylines II
Hello, Mayors!
We’ve released a hotfix to address security vulnerabilities found in the specific Unity runtime used by Cities: Skylines II. To review the full advisory and technical details, please see Unity’s security bulletin linked below.
Unity security advisory — September 2025
Note: these security issues do not affect the original Cities: Skylines (1); no update is required for that title.