Quick answers
- Is CVE-2026-123847 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-123847 being exploited in the wild.
- How severe is CVE-2026-123847?
- Medium severity, with a CVSS score of 5.3, published 6 November 2026.
- Which products and versions are affected?
- Jetbrains IntelliJ IDEA before 2026.3.
- Is there a fix for CVE-2026-123847?
- 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-2026-123847 attacked?
- It is attacked with local access, in a web application.
- Am I affected by CVE-2026-123847?
- 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
The vulnerability exists in the terminal command completion feature of IntelliJ IDEA, where insufficient validation of control characters in completion suggestions allows command injection. An attacker can craft malicious completion entries containing control characters to execute arbitrary system commands when a developer interacts with the terminal completion interface, gaining code execution within the context of the IDE user.
Affected products
- JetBrains IntelliJ IDEA before 2026.3
Timeline
- 2026-11-06: disclosed