Technology

Claude Extension Flaw Enabled Zero-Click XSS Prompt Injection via Any Website

Cybersecurity researchers have disclosed a vulnerability in Anthropic’s Claude Google Chrome Extension that could have been exploited to trigger malicious prompts simply by visiting a web page. The flaw “allowed any website to silently inject prompts into that assistant as if the user wrote them,” Koi Security researcher Oren Yomtov said in a report shared […]

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[Webinar] Stop Guessing. Learn to Validate Your Defenses Against Real Attacks

Most teams have security tools in place. Alerts are firing, dashboards look clean, threat intel is flowing in. On the surface, everything feels under control. But one question usually stays unanswered: Would your defenses actually stop a real attack? That’s where things get shaky. A control exists, so it’s assumed to work. A detection rule

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China-Linked Red Menshen Uses Stealthy BPFDoor Implants to Spy via Telecom Networks

A long-term and ongoing campaign attributed to a China-nexus threat actor has embedded itself in telecom networks to conduct espionage against government networks. The strategic positioning activity, which involves implanting and maintaining stealthy access mechanisms within critical environments, has been attributed to Red Menshen, a threat cluster that’s also tracked as Earth Bluecrow,

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ThreatsDay Bulletin: PQC Push, AI Vuln Hunting, Pirated Traps, Phishing Kits & 20 More Stories

Some weeks in security feel loud. This one feels sneaky. Less big dramatic fireworks, more of that slow creeping sense that too many people are getting way too comfortable abusing things they probably shouldn’t even be touching. There’s a little bit of everything in this one, too. Weird delivery tricks, old problems coming back in

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Masters of Imitation: How Hackers and Art Forgers Perfect the Art of Deception

Unmasking impostors is something the art world has faced for decades, and there are valuable lessons from the works of Elmyr de Hory that can apply to the world of defensive cybersecurity. During the 1960s, de Hory gained infamy as a premier forger, passing off counterfeit masterworks of Picasso, Matisse, and Renoir to unsuspecting collectors

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The Kill Chain Is Obsolete When Your AI Agent Is the Threat

In September 2025, Anthropic disclosed that a state-sponsored threat actor used an AI coding agent to execute an autonomous cyber espionage campaign against 30 global targets. The AI handled 80-90% of tactical operations on its own, performing reconnaissance, writing exploit code, and attempting lateral movement at machine speed. This incident is worrying, but there’s a

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GlassWorm Malware Uses Solana Dead Drops to Deliver RAT and Steal Browser, Crypto Data

Cybersecurity researchers have flagged a new evolution of the GlassWorm campaign that delivers a multi-stage framework capable of comprehensive data theft and installing a remote access trojan (RAT), which deploys an information-stealing Google Chrome extension masquerading as an offline version of Google Docs. “It logs keystrokes, dumps cookies and session tokens, captures screenshots, and

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LeakBase Admin Arrested in Russia Over Massive Stolen Credential Marketplace

The alleged administrator of the LeakBase cybercrime forum has been arrested by Russian law enforcement authorities, state media reported Thursday. According to TASS and MVD Media, a news website linked to the Russian Interior Ministry, the suspect is a resident of the city of Taganrog. The suspect is said to have been detained for creating

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Device Code Phishing Hits 340+ Microsoft 365 Orgs Across Five Countries via OAuth Abuse

Cybersecurity researchers are calling attention to an active device code phishing campaign that’s targeting Microsoft 365 identities across more than 340 organizations in the U.S., Canada, Australia, New Zealand, and Germany. The activity, per Huntress, was first spotted on February 19, 2026, with subsequent cases appearing at an accelerated pace since then. Notably, the campaign

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Russian Hacker Sentenced to 2 Years for TA551 Botnet-Driven Ransomware Attacks

The U.S. Department of Justice (DoJ) said a Russian national has been sentenced to two years in prison for managing a botnet that was used to launch ransomware attacks against U.S. companies. Ilya Angelov, 40, of Tolyatti, Russia, was also fined $100,000. Angelov, who went by the online aliases “milan” and “okart,” is said to

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