# CVE-2026-123855: JetBrains Toolbox App command injection via configuration URLs

Source: https://junglewise.ai/threats/cve-2026-123855-in-jetbrains-toolbox-app-before-3-6-1-command-injection-was  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-06. Updated: 2026-11-06  
License: CC BY 4.0 with a link back

CVE-2026-123855 · Severity: high · CVSS 7.5 · Published 2026-11-06

JetBrains Toolbox App is a launcher and updater for JetBrains development tools used by software developers. An attacker can inject arbitrary commands through specially crafted enterprise configuration URLs, potentially gaining code execution on a developer's machine. This could allow remote takeover of development environments and access to source code repositories and credentials.

Technologies: [Jetbrains Toolbox App](https://junglewise.ai/threats/technologies/toolbox-app). Vendors: [Jetbrains](https://junglewise.ai/threats/vendors/jetbrains).

## Quick answers

**Is CVE-2026-123855 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-123855 being exploited in the wild.

**How severe is CVE-2026-123855?** High severity, with a CVSS score of 7.5, published 6 November 2026.

**Which products and versions are affected?** Jetbrains Toolbox App before 3.6.1.

**Is there a fix for CVE-2026-123855?** Yes: fixed in 3.6.1. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-123855 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-123855?** Check whether you run Jetbrains Toolbox App at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 3.6.1

## Technical details

A command injection vulnerability exists in JetBrains Toolbox App's handling of enterprise configuration URLs. By crafting a malicious configuration URL, an attacker can inject and execute arbitrary system commands on the host where Toolbox App is running. The vulnerability affects versions before 3.6.1 and requires user interaction (clicking a malicious link or being directed to it).

## Affected products

- JetBrains Toolbox App before 3.6.1

## Timeline

- 2026-11-06: disclosed

## References

- [https://www.jetbrains.com/privacy-security/issues-fixed/](https://www.jetbrains.com/privacy-security/issues-fixed/)

## Related threats

- [JetBrains Toolbox App nTLM hash disclosure via SVG icons](https://junglewise.ai/threats/cve-2026-123856-in-jetbrains-toolbox-app-before-3-6-1-ntlm-hash-disclosure-was)
- [JetBrains Toolbox App and IDEs compromised certificate trust](https://junglewise.ai/threats/cve-2026-118697-in-jetbrains-toolbox-app-before-3-9-1-and-3-8-2-intellij-idea)
- [JetBrains IDEs embedded browser trusted revoked certificates](https://junglewise.ai/threats/cve-2026-118696-in-jetbrains-intellij-idea-pycharm-phpstorm-rubymine-and)