The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server with your computer. A code injection in Nextcloud Desktop Client for macOS allowed to load arbitrary code when starting the client with DYLD_INSERT_LIBRARIES set in the enviroment. It is recommended that the Nextcloud Desktop client is upgraded to 3.12.0.
https://hackerone.com/reports/2307625
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-4mf7-v63m-99p7