CVE-2026-18482 CVE-2026-18482
Attackers can execute arbitrary OS commands via unsafe path interpolation in Neo.mjs MCP server tools when AI agents are manipulated.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-18482?
CVE-2026-18482 is a critical command injection vulnerability in Klarso GmbH neo-mjs, published on 20 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Neo.mjs contains a command injection vulnerability within the FileSystemService.mjs component of the ai/mcp/server/file-system MCP server, where the checkSyntax() and runPlaywrightTest() functions unsafely interpolate caller-controlled absolutePath values into shell commands, enabling arbitrary OS command execution when an AI agent is induced to invoke these tools. Commit 88c77fc fixes these vulnerabilities.
Weakness: CWE-78
Which versions are affected by CVE-2026-18482?
How do I fix CVE-2026-18482?
No fix has been published for CVE-2026-18482 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-18482 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-18482 exists.
Sources
Also known as GHSA-cmg9-62q9-xmww.