# CVE-2026-123858: JetBrains PhpStorm automatic project file upload to deployment server

Source: https://junglewise.ai/threats/cve-2026-123858-in-jetbrains-phpstorm-before-2026-3-project-files-could-be  
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-2026-123858 · Severity: medium · CVSS 4.4 · Published 2026-11-06

PhpStorm is an integrated development environment (IDE) used by developers to write and test code. When opening an untrusted project, PhpStorm could automatically upload project files to a configured deployment server without explicit user confirmation, potentially exposing source code or sensitive files to unauthorized servers. This creates a risk when developers open projects from untrusted sources.

Technologies: [Jetbrains PhpStorm](https://junglewise.ai/threats/technologies/phpstorm). Vendors: [Jetbrains](https://junglewise.ai/threats/vendors/jetbrains).

## Quick answers

**Is CVE-2026-123858 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-123858 being exploited in the wild.

**How severe is CVE-2026-123858?** Medium severity, with a CVSS score of 4.4, published 6 November 2026.

**Which products and versions are affected?** Jetbrains PhpStorm before 2026.3.

**Is there a fix for CVE-2026-123858?** Yes: fixed in PhpStorm 2026.3. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-123858 attacked?** It is attacked with local access.

**Am I affected by CVE-2026-123858?** Check whether you run Jetbrains PhpStorm 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 PhpStorm 2026.3

## Technical details

PhpStorm before version 2026.3 fails to properly validate deployment server configuration before performing automatic file uploads when an untrusted project is opened. An attacker can craft a malicious project with deployment settings pointing to an attacker-controlled server, causing files to be uploaded when the project is opened by a developer. The vulnerability requires user interaction (opening a project) and local access, but no authentication is required on the attacker's server to receive the uploaded files.

## Affected products

- JetBrains PhpStorm before 2026.3

## Timeline

- 2026-11-06: disclosed

## References

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

## Related threats

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- [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)
- [JetBrains PhpStorm arbitrary code execution via configured interpreter](https://junglewise.ai/threats/cve-2026-64809-jetbrains-phpstorm-arbitrary-code-execution-via-configured)
- [JetBrains PhpStorm arbitrary code execution in project tooling](https://junglewise.ai/threats/cve-2026-64808-jetbrains-phpstorm-arbitrary-code-execution-in-project-tooling)