Quick answers
- Is CVE-2026-123307 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-123307 being exploited in the wild.
- How severe is CVE-2026-123307?
- Medium severity, with a CVSS score of 6.8, published 6 November 2026.
- Which products and versions are affected?
- Jetbrains IntelliJ IDEA before 2026.3 and 2026.2.4.
- Is there a fix for CVE-2026-123307?
- Yes: fixed in IntelliJ IDEA 2026.3, 2026.2.4. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-123307 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-123307?
- 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, 2026.2.4
Technical details
The run configurations feature in IntelliJ IDEA before versions 2026.3 and 2026.2.4 permits unauthenticated connections to arbitrary hosts, suggesting inadequate validation or authentication controls on network operations initiated through this component. An attacker with local access or the ability to modify run configurations could establish unauthorized connections. The vulnerability is remotely exploitable through network-based attack vectors when run configurations are triggered.
Affected products
- JetBrains IntelliJ IDEA before 2026.3 and 2026.2.4
Timeline
- 2026-11-06: disclosed