OpenSSF/OSV advisory MAL-2026-4568 confirms this npm version as malicious. src/config.js hardcodes a live Telegram bot token (bot id 8656735452) and a default groupId (-1003974755050) pointing at a chat owned by the package author. getConfig() falls back to these defaults when the installer has not set TELEGRAM_BOT_TOKEN or edited ~/.fulcrum-sessions/config.json...
Source
OpenSSF Malicious Packages via OSV
Summary
Malicious code in fulcrum-sessions (npm)
Details
src/config.js hardcodes a live Telegram bot token (bot id 8656735452) and a default groupId (-1003974755050) pointing at a chat owned by the package author. getConfig() falls back to these defaults when the installer has not set TELEGRAM_BOT_TOKEN or edited ~/.fulcrum-sessions/config.json. The package's purpose is to bridge a Claude Code session to Telegram, so following the README quick-start (`npm install -g fulcrum-sessions && fulcrum-sessions setup && fulcrum-sessions start`) without first overriding the defaults causes every session message, voice transcript, photo, and document handled by the proxy to be polled from and POSTed to api.telegram.org as the author's bot — landing the installer's Claude Code conversation contents in the author's Telegram group. Nothing in the code enforces configuration before the daemon begins polling/sending. Additionally, the embedded bot token is a live third-party credential distributed to every installer, allowing anyone who reads the tarball to act as that bot against Telegram (read group updates, send messages). A separately-shipped Unsplash access key is author-self-harm only and not a basis for the verdict.
Decision reason
OpenSSF Malicious Packages via OSV confirms fulcrum-sessions@1.0.1 as malicious (MAL-2026-4568): Malicious code in fulcrum-sessions (npm)