Latest cybersecurity reporting from selected sources.

Cybersecurity researchers have attributed the April 2026 DigiCert security incident to a threat activity cluster dubbed CylindricalCanine

A U.S. government agency paid $1M to Kairos, a group focused on data theft and extortion rather than ransomware, Ransom-ISAC reports. A new case study from Ransom-ISAC reconstructs a complete data-extortion incident involving a U.S. government body and a threat actor called Kairos, using a leaked negotiation transcript and blockchain tracing of the ransom payment. […]

ServiceNow has warned about a security incident in which unknown threat actors exploited a flaw to obtain deeper unauthorized access to susceptible instances

Storm-2949 turned stolen credentials into a cloud-wide breach, moving from identity compromise to large-scale data theft without using malware. This incident shows how threat actors can exploit trusted systems to operate undetected. The post How Storm-2949 turned a compromised identity into a cloud-wide breach appeared first on Microsoft Security Blog.

Cloud development platform Vercel has disclosed a security incident after threat actors claimed to have breached its systems and are attempting to sell stolen data. [...]

Unknown threat actors compromised CPUID ("cpuid[.]com"), a website that hosts popular hardware monitoring tools like CPU-Z, HWMonitor, HWMonitor Pro, and PerfMonitor, for less than 24 hours to serve malicious executables for the software and deploy a remote access trojan called STX RAT

Unknown threat actors have hijacked the update system for the Smart Slider 3 Pro plugin for WordPress and Joomla to push a poisoned version containing a backdoor

UK NCSC's Richard Horne on Strengthening Cyber Defense and Incident ResponseCyber risk is rising as digital dependence grows and threat actors expand. NCSC CEO Richard Horne outlines why leaders must treat cybersecurity as mission-critical, strengthen their resilience, and align defense efforts to counter ransomware, AI-driven threats, and supply chain attacks.

UK NCSC's Richard Horne on Strengthening Cyber Defense and Incident ResponseCyber risk is rising as digital dependence grows and threat actors expand. NCSC CEO Richard Horne outlines why leaders must treat cybersecurity as mission-critical, strengthen their resilience, and align defense efforts to counter ransomware, AI-driven threats, and supply chain attacks.

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

Canadian business process outsourcing giant Telus Digital has confirmed it suffered a security incident after threat actors claimed to have stolen nearly 1 petabyte of data from the company in a multi-month breach. [...]

Compromise Affects Healthcare Clients of Co.'s Revenue Cycle Management ServicesBilling services vendor Trizetto Provider Solutions is notifying 3.4 million individuals of a hacking incident discovered in October 2025 that investigators have now determined started nearly a year earlier, when threat actors accessed the company's healthcare clients' insurance related data.

Incident Responders Detail Top Ransomware and Business Email Compromise TacticsThere's no need to invest into sophisticated hacking operations when moving fast and exploiting well-trod techniques gives threat actors all the access they want. Threat actors are prioritizing "low-complexity entry points, rather than investing in sophisticated exploits," say incident responders.

Spanish flag carrier Iberia has begun notifying customers of a data security incident stemming from a compromise at one of its suppliers. The disclosure comes days after a threat actor claimed on hacker forums to have access to 77 GB of data allegedly stolen from the airline. [...]

The North Korea-linked threat actor known as Kimsuky has distributed a previously undocumented backdoor codenamed HttpTroy as part of a likely spear-phishing attack targeting a single victim in South Korea

Toys "R" Us Canada has sent notices of a data breach to customers informing them of a security incident where threat actors leaked customer records they had previously stolen from its systems. [...]

Major international auction house Sotheby's is notifying individuals of a data breach incident on its systems where threat actors stole sensitive information, including financial details. [...]

Major international auction house Sotheby's is notifying customers of a data breach incident on its systems where threat actors stole sensitive information, including financial details. [...]

Threat actors are abusing Velociraptor, an open-source digital forensics and incident response (DFIR) tool, in connection with ransomware attacks likely orchestrated by Storm-2603 (aka CL-CRI-1040 or Gold Salem), which is known for deploying the Warlock and LockBit ransomware

Threat actors have started to use the Velociraptor digital forensics and incident response (DFIR) tool in attacks that deploy LockBit and Babuk ransomware. [...]