Manifold Security found 77 malicious extensions on Open VSX, the open marketplace that editors like VSCodium, Cursor, and Windsurf pull extensions from, impersonating legitimate developer tools. Detected between July 26 and August 1, all 77 were linked through a shared exfiltration domain and common code. Fifty-eight sent only basic system information, while the other 19 performed deeper reconnaissance, exfiltrating developer, Git repository, and continuous integration metadata. Manifold found no access to source code, credentials, tokens, or SSH material and did not determine the campaign's goal. The extensions were pulled from Open VSX by August 3, but must still be removed manually from affected machines.
Socket reported 73 newly identified malicious extensions on Open VSX, the marketplace used by VS Code, Cursor, and Windsurf editors. The extensions impersonate popular developer tools - same name, same icon, but published by newly-created GitHub accounts with empty repositories. Instead of being malicious from day one, they sit harmlessly for weeks gathering downloads and trust, then push a 'normal' update that silently installs malware. Six of the 73 extensions have already activated; the rest are still in the sleeper phase. The campaign is part of GlassWorm, an ongoing supply-chain attack family that has been working its way through npm, GitHub, and editor extension marketplaces since 2025.
TrustStrike Labs