Is CVE-2026-123308 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-123308 being exploited in the wild.

How severe is CVE-2026-123308?

Medium severity, with a CVSS score of 6.3, published 6 November 2026.

Which products and versions are affected?

Jetbrains IntelliJ IDEA before 2026.3.

Is there a fix for CVE-2026-123308?

Yes: fixed in IntelliJ IDEA 2026.3. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-123308 attacked?

It is attacked with local access, in a web application.

Am I affected by CVE-2026-123308?

Check whether you run Jetbrains IntelliJ IDEA 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.

CVE-2026-123308: JetBrains IntelliJ IDEA code execution via document import

CVE-2026-123308 · Severity: medium · CVSS 6.3 · Published 2026-11-06

JetBrains IntelliJ IDEA is a development environment used by programmers to write and debug code. When opening an untrusted project, the application could execute malicious code during the document import process, allowing an attacker to compromise a developer's machine. This could lead to theft of source code, credentials, or use of the compromised machine for further attacks.

Technologies: Jetbrains IntelliJ IDEA. Vendors: Jetbrains.

Quick answers

Is CVE-2026-123308 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-123308 being exploited in the wild.
How severe is CVE-2026-123308?: Medium severity, with a CVSS score of 6.3, published 6 November 2026.
Which products and versions are affected?: Jetbrains IntelliJ IDEA before 2026.3.
Is there a fix for CVE-2026-123308?: Yes: fixed in IntelliJ IDEA 2026.3. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-123308 attacked?: It is attacked with local access, in a web application.
Am I affected by CVE-2026-123308?: Check whether you run Jetbrains IntelliJ IDEA 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: IntelliJ IDEA 2026.3

Technical details

A code execution vulnerability exists in IntelliJ IDEA's document import functionality that is triggered when loading untrusted projects. The vulnerability allows arbitrary code execution without requiring elevated privileges or user interaction beyond opening a malicious project. The flaw has been fixed in version 2026.3 and later.

Affected products

JetBrains IntelliJ IDEA before 2026.3

Timeline

2026-11-06: disclosed

References

https://www.jetbrains.com/privacy-security/issues-fixed/

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