In JetBrains Junie before 252.549.29 command execution was possible via malicious project file

The primary impact of CVE-2026-41153 is the potential for remote code execution (RCE). An attacker could craft a specially designed project file that, when opened or processed by JetBrains Junie, would execute arbitrary commands on the host system. This could allow the attacker to gain control of the system, steal sensitive data, install malware, or perform other malicious actions. The blast radius extends to any system running a vulnerable version of JetBrains Junie and where a user can be tricked into opening a malicious project file. While the initial attack vector requires user interaction (opening the malicious file), the consequences can be severe.

Developers and users who rely on JetBrains Junie for project management are at risk. Specifically, those who frequently work with project files from external sources or untrusted collaborators are at higher risk. Users who have not yet updated to the latest version of Junie are particularly vulnerable.

• windows / supply-chain: Monitor PowerShell execution logs for commands related to JetBrains Junie. Check for suspicious project files in Junie's working directories.

Get-Process -Name Junie | Select-Object -ExpandProperty Path

• linux / server: Monitor system logs (e.g., /var/log/syslog, /var/log/auth.log) for command execution attempts originating from Junie.

journalctl -u junie | grep -i 'command execution'

• generic web: While not directly applicable to a web component, monitor access logs for requests to Junie's file handling endpoints, looking for unusual patterns or file extensions.

1. 2026-04-17Disclosure

   disclosure

1. Reservado2026-04-17
2. Publicada2026-04-17
3. Modificada2026-04-20
4. EPSS atualizado2026-04-25

The primary mitigation for CVE-2026-41153 is to immediately upgrade JetBrains Junie to version 252.549.29 or later. If an immediate upgrade is not possible due to compatibility issues or testing requirements, consider implementing stricter file access controls to prevent users from opening untrusted project files. Educate users about the risks of opening files from unknown or untrusted sources. There are no specific WAF or proxy rules that can directly mitigate this vulnerability, as it relies on processing malicious project files within the application itself. Monitor system logs for unusual command execution activity related to Junie.