In affected versions of Octopus Server, a user with permission to upload a malicious nuget package is able to deploy a script step so the script executes outside of the parent directory.

{
                    "vendor": "Octopus Deploy",
                    "product": "Octopus Server",
                    "platforms": [
                        "Windows",
                        "Linux"
                    ],
                    "versions": [
                        {
                            "status": "affected",
                            "version": "2023.0.0",
                            "lessThan": "2026.1.674",
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "2026.1",
                            "lessThan": "2026.1.674",
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "2026.2",
                            "lessThan": "2026.2.973",
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "2026.3",
                            "lessThan": "2026.3.5839",
                            "versionType": "custom"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }