CVE-2025-26074: 
Java vulnerability analysis and mitigation

Orkes Conductor v3.21.11 allows remote attackers to execute arbitrary OS commands through unrestricted access to Java classes. The vulnerability was discovered on June 30, 2025, and affects the core functionality of the Conductor workflow orchestration platform (NVD, Medium Blog).

The vulnerability stems from the unsafe use of the Nashorn JavaScript engine without proper restrictions in Conductor's Inline tasks. The flaw occurs when Nashorn is executed without the --no-java flag and no sandboxing or input validation is in place. This allows attackers to inject Java code directly through inline JavaScript, enabling arbitrary code execution. The vulnerability has been assigned a CVSS v3.1 base score of 9.8 CRITICAL (Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) (NVD, Medium Blog).

The vulnerability allows attackers to gain full remote shell access on the server running Conductor. Through a malicious workflow containing specially crafted JavaScript code, attackers can execute arbitrary OS commands, potentially leading to complete system compromise (Medium Blog).

Organizations should immediately upgrade to Conductor version 3.21.13 or later. Additional security measures include: never exposing Conductor OSS to the Internet, limiting who can define or update workflows, and ensuring proper access controls are in place (Medium Blog).