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