JetBrains IntelliJ IDEA: Schwachstelle ermöglicht Codeausführung
WID-SEC-2026-3679 · first 01.10.2026 · updated 01.10.2026 · CVSS 7,8
What it is about
IntelliJ IDEA ist eine Java Entwicklungsumgebung (IDE). Ein entfernter, anonymer Angreifer kann eine Schwachstelle in JetBrains IntelliJ IDEA ausnutzen, um beliebigen Programmcode auszuführen.
Under what conditions?
Over the network and without logging in. This is the most dangerous combination: attackers can scan reachable devices automatically.
What can happen in the worst case
An attacker could use the vulnerability to
- beliebigen Programmcode auszuführen
Am I affected?
Affected according to the BSI:
- JetBrains IntelliJ IDEA <2026.2.3
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- JetBrains IntelliJ IDEA 2026.2.3
Is the vulnerability already being exploited?
None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.
Information and sources
- Original BSI advisory (WID)
- GitHub Security Advisory GHSA-x2cm-2gq8-g82v vom 2026-09-30 github.com
- National Vulnerability Database CVE-2026-100256 vom 2026-09-30 nvd.nist.gov
CVE: CVE-2026-100256
Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.