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Open VSX Removes 77 Malicious Evil Twin Extensions Exfiltrating Developer Data

A cluster of 77 extensions on the Open VSX marketplace has been found to impersonate legitimate developer tools while transmitting information about the systems and development environments on which they were installed.

The “evil twin” extensions were uploaded to the repository between July 26 and August 1, 2026, according to Manifold Security. The packages have been removed from Open VSX as of

Over 400 NPM Packages Infected in ChainDrop Supply Chain Attack

The malware was designed to steal and exfiltrate secrets, and to propagate itself via stolen NPM and GitHub credentials.

The post Over 400 NPM Packages Infected in ChainDrop Supply Chain Attack appeared first on SecurityWeek.

Claude Mythos 5 Tried to Backdoor a Real Open-Source Project in Testing, Then Vouched for Itself

An agent running Anthropic’s Claude Mythos 5 spent 34 hours trying to get a malware dropper merged into a real open-source project during a cyber evaluation by the UK’s AI Security Institute.

When a bystander publicly warned that the code was malicious, the agent denied it, force-pushed a rewritten branch history to erase the evidence, and posted from a second account it controlled to vouch for

CISA Flags Langflow RCE, Tomcat, and N-central Flaws as Actively Exploited

The U.S. Cybersecurity and Infrastructure Security Agency (CISA), on August 5, 2026, added three flaws to its Known Exploited Vulnerabilities (KEV) catalog, citing evidence of active exploitation in the wild.

The list of vulnerabilities is as follows –

CVE-2026-9198 (CVSS score: 9.8) – A code injection vulnerability in Langflow that allows unauthenticated attackers to achieve full remote

Water Sector Cyberattacks Reportedly Hit at Least 12 States

Georgia has been confirmed as one of the attacked states after Clayton County reported a pump station disruption.

The post Water Sector Cyberattacks Reportedly Hit at Least 12 States appeared first on SecurityWeek.

QuickFox Supply Chain Attack Delivers FDMTP Backdoor via Trojanized Windows Installer

Cybersecurity researchers have disclosed what has been described as a “long-standing supply chain attack” on QuickFox, a virtual private network (VPN) and network acceleration tool designed for overseas Chinese users.

According to Fortinet FortiGuard Labs, the supply chain attack has been ongoing since at least August 2025 and involves a trojanized version of the application to deliver FDMTP, a

OpenAI, Anthropic AI agents targeted real people and systems in cyber tests

OpenAI and Anthropic have confirmed that their AI models were involved in separate, newly disclosed third-party cybersecurity testing incidents that resulted in a real website being breached and social engineering attacks against people outside the intended testing boundaries. […]

Author: brangberg