Nezha Monitoring is a self-hostable, lightweight, servers and websites monitoring and O&M tool. From version 0.20.0 to before version 2.0.12, authenticated agents can forge service-monitor results for other users' services. This issue has been patched in version 2.0.12.
https://github.com/nezhahq/nezha/security/advisories/GHSA-4g6j-g789-rghm