CVE-2026-117530 in Junie CLI
Summary
by MITRE • 10/27/2026
In JetBrains Junie CLI before 26.8.17 command execution was possible due to incomplete validation of allowlisted commands
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Analysis
by VulDB Data Team • 10/27/2026
The vulnerability identified in JetBrains Junie CLI prior to version 26.8.17 represents a critical security flaw rooted in insufficient input validation mechanisms within the application's command processing logic. This issue specifically affects how the tool handles and executes external commands, revealing a fundamental weakness in the implementation of allowlist-based access controls. In secure software design, an allowlist approach is intended to restrict execution to only those commands that have been explicitly approved by developers or administrators. However, due to incomplete validation, the application fails to rigorously verify whether user-supplied inputs strictly conform to this predefined set of permitted actions before proceeding with execution. This gap allows attackers to bypass security restrictions and inject arbitrary command strings that were not originally intended for execution within the context of the CLI tool.
From a technical perspective, this flaw aligns closely with CWE-78 Improper Neutralization of Special Elements used in an OS Command, commonly known as OS Command Injection. The root cause lies in the failure to properly sanitize or validate input parameters that are passed directly to operating system shell interpreters or command execution functions. When the application processes user inputs without adequate checks against special characters, escape sequences, or alternative syntax variations, it inadvertently permits the construction of malicious payloads. These payloads can exploit parsing ambiguities or logical errors in the validation routine, effectively tricking the CLI into executing unintended system commands with the privileges granted to the Junie process. This type of vulnerability is particularly dangerous because it transforms a utility tool designed for developer assistance into a potential vector for remote code execution if exposed to untrusted input sources.
The operational impact of this vulnerability can be severe depending on the context in which JetBrains Junie CLI operates. If an attacker successfully exploits this command injection flaw, they may achieve arbitrary code execution on the host machine where the vulnerable version is installed. This could lead to unauthorized access to sensitive project files, theft of credentials or API keys stored locally, installation of malware, or use of the compromised system as a pivot point for further attacks within a network environment. Given that development tools often run with elevated privileges during build and deployment processes, the potential damage extends beyond simple data exfiltration to include complete compromise of the development infrastructure. Attackers could manipulate source code repositories, inject malicious dependencies into projects, or disrupt continuous integration pipelines by altering execution flows through injected commands.
This vulnerability also maps to specific techniques within the MITRE ATT&CK framework, particularly T1059 Command and Scripting Interpreter, which covers abuse of command-line interfaces for executing arbitrary instructions. The exploitation scenario typically involves an attacker providing crafted input that bypasses the allowlist validation logic, thereby gaining a foothold in the system through legitimate application functionality. This aligns with broader categories such as Initial Access or Execution phases depending on whether the vulnerability is triggered remotely via a web interface integrated with Junie or locally by a malicious actor with access to user inputs. The lack of strict enforcement mechanisms highlights a common pitfall in CLI tool development where convenience and flexibility are prioritized over rigorous security boundaries, leaving systems exposed to exploitation through simple input manipulation.
To mitigate this risk, organizations must immediately upgrade JetBrains Junie CLI to version 26.8.17 or later, which addresses the incomplete validation of allowlisted commands by implementing stricter parsing rules and robust sanitization routines. Until an update is applied, administrators should restrict access to the tool to trusted users only and avoid processing untrusted input within any workflows that invoke Junie functionality. Additionally, employing principle of least privilege ensures that even if exploitation occurs, the potential damage is contained by limiting the permissions associated with the user account running the CLI application. Regular security audits and static code analysis focused on command injection patterns can help identify similar weaknesses in other custom or third-party tools used within development environments, ensuring a more resilient posture against input-based attacks.