Severity: Informational

Devs Hit by Trojanized Claude Code Extension for Cursor

Two serious security issues hit Cursor on the same day, highlighting the risks for AI-powered integrated development environments (IDEs).

Excerpt from the primary source: Dark Reading

Who is affected

Small businesses · Developers

Affected technology: Claude

What you should do

No specific action is required at this time.

Sources

We link to original and authoritative sources. Headlines and excerpts belong to their publishers.

Original reporting

Devs Hit by Trojanized Claude Code Extension for Cursor Dark Reading · darkreading.com · Oct 30, 2026 · Primary source
Severity: ElevatedAction: Be aware

Critical Linux kernel flaw allows remote root attacks on MPTCP servers

Security researchers at Anthropic have developed an exploit for a critical Linux kernel vulnerability that allows unauthenticated attackers to remotely execute commands as root on servers running Multipath TCP (MPTCP) listeners.

Severity: ElevatedAction: Be aware

Malicious Claude Code extension on Cursor planted SSH backdoors

A malicious version of Anthropic's Claude Code VS Code extension was distributed through Cursor's extension marketplace for approximately 11 hours on October 29, exposing up to 5,000 developers to malware designed to install persistent SSH backdoors.