Ransomware attackers targeting a Fortune 100 company in the finance sector used a new malware strain, dubbed PDFSider, to deliver malicious payloads on Windows systems. [...]

The U.K. government is warning of continued malicious activity from Russian-aligned hacktivist groups targeting critical infrastructure and local government organizations in the country in disruptive denial-of-service (DDoS) attacks. [...]

The Canadian Investment Regulatory Organization (CIRO) confirmed that the data breach it suffered last year impacts about 750,000 Canadian investors. [...]

Another set of 17 malicious extensions linked to the GhostPoster campaign has been discovered in Chrome, Firefox, and Edge stores, where they accumulated a total of 840,000 installations. [...]

A cross-site scripting (XSS) flaw in the web-based control panel used by operators of the StealC info-stealing malware allowed researchers to observe active sessions and gather intelligence on the attackers' hardware. [...]

The identity of the Black Basta ransomware gang leader has been confirmed by law enforcement in Ukraine and Germany, and the individual has been added to the wanted list of Europol and Interpol. [...]

An advanced threat actor tracked as UAT-8837 and believed to be linked to China has been focusing on critical infrastructure systems in North America, gaining access by exploiting both known and zero-day vulnerabilities. [...]

The Gootloader malware, typically used for initial access, is now using a malformed ZIP archive designed to evade detection by concatenating up to 1,000 archives. [...]

Hackers are actively exploiting a maximum severity flaw in the Modular DS WordPress plugin that allows them to bypass authentication remotely and access the vulnerable sites with admin-level privileges. [...]

Microsoft announced that the Copilot Studio extension for the Visual Studio Code (VS Code) integrated development environment is now available to all users. [...]

The Kyowon Group (Kyowon), a South Korean conglomerate, disclosed that a cyberattack has disrupted its operations and customer information may have been exposed in the incident. [...]

The French data protection authority (CNIL) has imposed cumulative fines of €42 million on Free Mobile and its parent company, Free, for inadequate protection of customer data against cyber threats. [...]

Technical details and a public exploit have been published for a critical vulnerability affecting Fortinet's Security Information and Event Management (SIEM) solution that could be leveraged by a remote, unauthenticated attacker to execute commands or code. [...]

Researchers identified an attack method dubbed "Reprompt" that could allow attackers to infiltrate a user's Microsoft Copilot session and issue commands to exfiltrate sensitive data. [...]

Officials of Ukraine's Defense Forces were targeted in a charity-themed campaign between October and December 2025 that delivered backdoor malware called PluggyApe. [...]

A newly discovered advanced cloud-native Linux malware framework named VoidLink focuses on cloud environments, providing attackers with custom loaders, implants, rootkits, and plugins designed for modern infrastructures. [...]

A data breach last year at Central Maine Healthcare (CMH) exposed sensitive information of more than 145,000 individuals. [...]

U.S. digital investment advisor Betterment confirmed that hackers breached its systems and sent fake crypto-related messages to some customers. [...]

The Amsterdam Court of Appeal sentenced a 44-year-old Dutch national to seven years in prison for multiple crimes, including computer hacking and attempted extortion. [...]