Storybook dev server may allow file changes from a malicious website

critical severity · published 2026-10-21

Storybook's preview does not validate the origin, so a malicious website may be able to cause unauthorized file changes through the dev server or the addon-mcp package. A changed file could be executed only under additional conditions.

Fixed in: 11.0.0-alpha.6

CVE: CVE-2026-114125

Source: GitHub Advisory

Am I affected?

You are affected if the installed version is older than 11.0.0-alpha.6. Check the version you have and update to 11.0.0-alpha.6 or later. The fixed version is verified against a vendor or advisory source.

Get the fix

FixLane has a reviewed fix procedure for this incident: a read-only check first, then the fix. Ask the Telegram bot, or connect an AI agent to the FixLane MCP server and call get_fix_prompt with incident id 1793 and your operating system.