Quick answers
- Is CVE-2026-123844 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-123844 being exploited in the wild.
- How severe is CVE-2026-123844?
- 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-2026-123844?
- 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-2026-123844 attacked?
- It is attacked with local access, in a web application.
- Am I affected by CVE-2026-123844?
- 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 server-side request forgery (SSRF) vulnerability exists in IntelliJ IDEA's custom plugin repository functionality, allowing attackers to induce arbitrary network requests. The vulnerability requires user interaction or local configuration to enable a malicious custom plugin repository. The SSRF can facilitate reconnaissance of internal networks or access to restricted resources.
Affected products
- JetBrains IntelliJ IDEA before 2026.3
Timeline
- 2026-11-06: disclosed