CVE-2026-111091 Code injection in Junie CLI
Attackers can execute arbitrary code via malicious MCP server configurations in untrusted projects using JetBrains Junie CLI.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-111091?
CVE-2026-111091 is a high-severity code injection vulnerability in JetBrains Junie CLI, published on 15 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
In JetBrains Junie CLI before 26.8.3 code execution was possible via an untrusted project's MCP server configuration
Weakness: CWE-829
Which versions are affected by CVE-2026-111091?
How do I fix CVE-2026-111091?
No fix has been published for CVE-2026-111091 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-111091 being exploited?
There is no known exploitation of CVE-2026-111091 in the wild and no public exploit code.
Sources
Also known as GHSA-44gv-r4c4-w64m.