CVE-2026-73222 Claude Code Templates: Unauthenticated OS command injection (RCE) in Claude Code Studio server (--studio)
Unauthenticated OS command injection in Claude Code Studio server allows arbitrary code execution via crafted API requests, compromising developer systems.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-73222?
CVE-2026-73222 is a high-severity command injection vulnerability in davila7 claude-code-templates, published on 11 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Claude Code Templates is a CLI tool for configuring and monitoring Claude Code. Prior to 1.29.4, the Claude Code Studio server launched by the --studio option in cli-tool/src/sandbox-server.js binds to all interfaces on port 3444, permits cross-origin requests, and requires no authentication. The POST /api/execute endpoint passes the prompt request-body field to executeLocalTask(), and POST /api/install-agent passes the agentName request-body field to a child process. The same unsafe agent field path is reachable from /api/execute through checkAndInstallAgent(). These attacker-controlled values reach child_process.spawn() with shell execution enabled, causing Node.js to construct a shell command in which metacharacters are interpreted. An attacker who can reach the port directly, or who convinces a developer running Studio to visit a malicious website, can execute arbitrary operating-system commands with the developer's privileges and compromise source code, credentials, and local data. This issue is fixed in version 1.29.4.
Which versions are affected by CVE-2026-73222?
2 open source packages ship an affected version, including claude-code-templates.
| Package | Affected | Fixed in |
|---|---|---|
claude-code-templates npm | All versions | 1.29.4 |
claude-code-templates npm | All versions | 1.29.4 |
How do I fix CVE-2026-73222?
Upgrade claude-code-templates to 1.29.4 or later.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-73222 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-73222 exists.
Sources
Also known as GHSA-79wm-x847-7cvg.