In affected versions of Octopus Server, OIDC token issuer validation was performed inconsistently. This could result in a token issued from a suitably configured non legitimate issuer being accepted as a token belonging to a service account…

{
                    "vendor": "Octopus Deploy",
                    "product": "Octopus Server",
                    "platforms": [
                        "Windows",
                        "Linux"
                    ],
                    "versions": [
                        {
                            "status": "affected",
                            "version": "2024.1.0",
                            "lessThan": "2026.1.11781",
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "2026.2.0",
                            "lessThan": "2026.2.13438",
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "2026.3.0",
                            "lessThan": "2026.3.15816",
                            "versionType": "custom"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }