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CVE-2025-56803 is a command injection issue in Figma Desktop for Windows 125.6.5 affecting the local plugin loader. According to the provided description, a crafted plugin manifest.json can set a malicious build field that is passed to child_process.exec without validation or sanitization. Because exec invokes operating system command processing, an attacker able to supply or modify a local plugin manifest can cause arbitrary OS commands to be executed in the context of the Figma Desktop user. The issue is disputed by the supplier, which states the behavior only permits a local user to attack themselves through a local plugin and that the local build procedure required for exploitation is not used for plugins distributed through the Figma Community.
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This repository demonstrates a proof-of-concept (PoC) exploit for CVE-2025-56803, an OS command injection vulnerability in the Figma Desktop Application (version 125.6.5). The vulnerability arises from the application's handling of the 'build' field in a plugin's manifest.json file: if present and a string, its value is executed directly via Node.js's child_process.exec() without validation. The PoC consists of a plugin directory ('poc-plugin') containing a manifest.json with the 'build' field set to 'calc.exe' (on Windows), which will be executed as soon as the plugin is loaded in Figma. The code.ts and code.js files are standard plugin boilerplate and do not contribute to the exploit; the exploit is entirely in the crafted manifest.json. The attack vector is local, requiring the victim to install and load a malicious plugin, which could be distributed via social engineering. No network endpoints or external domains are involved; the only fingerprintable endpoint is the manifest.json file itself. The exploit demonstrates arbitrary command execution, and the repository is structured as a minimal Figma plugin template with the exploit payload embedded in the manifest.
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