This High severity RCE (Remote Code Execution) vulnerability was introduced in versions 4.2.8 of Sourcetree for Mac and 3.4.19 for Sourcetree for Windows. This RCE (Remote Code Execution) vulnerability, with a CVSS Score of 8.8, allows an unauthenticated attacker to execute arbitrary code which has high impact to confidentiality, high impact to integrity, high impact to availability, and requires user interaction. Atlassian recommends that Sourcetree for Mac and Sourcetree for Windows customers upgrade to latest version, if you are unable to do so, upgrade your instance to one of the specified supported fixed versions: Sourcetree for Mac 4.2: Upgrade to a release greater than or equal to 4.2.9 Sourcetree for Windows 3.4: Upgrade to a release greater than or equal to 3.4.20 See the release notes ([https://www.sourcetreeapp.com/download-archives]). You can download the latest version of Sourcetree for Mac and Sourcetree for Windows from the download center ([https://www.sourcetreeapp.com/download-archives]). This vulnerability was reported via our Penetration Testing program.