Microsoft is investigating reports that some Windows 11 devices are failing to boot with "UNMOUNTABLE_BOOT_VOLUME" errors after installing the January 2026 Patch Tuesday security updates. [...]

Microsoft has released emergency, out-of-band updates on Saturday for Windows 10, Windows 11, and Windows Server to fix an issue that prevented Microsoft Outlook classic from opening when using PSTs stored in cloud storage. [...]

A cyberattack targeting Poland's power grid in late December 2025 has been linked to the Russian state-sponsored hacking group Sandworm, which attempted to deploy a new destructive data-wiping malware dubbed DynoWiper during the attack.. [...]

The ShinyHunters extortion gang claims it is behind a wave of ongoing voice phishing attacks targeting single sign-on (SSO) accounts at Okta, Microsoft, and Google, enabling threat actors to breach corporate SaaS platforms and steal company data for extortion. [...]

Okta is warning about custom phishing kits built specifically for voice-based social engineering (vishing) attacks. BleepingComputer has learned that these kits are being used in active attacks to steal Okta SSO credentials for data theft. [...]

The developer of the popular curl command-line utility and library announced that the project will end its HackerOne security bug bounty program at the end of this month, after being overwhelmed by low-quality AI-generated vulnerability reports. [...]

People worldwide are being targeted by a massive spam wave originating from unsecured Zendesk support systems, with victims reporting receiving hundreds of emails with strange and sometimes alarming subject lines. [...]

Cisco has fixed a critical Unified Communications and Webex Calling remote code execution vulnerability, tracked as CVE-2026-20045, that has been actively exploited as a zero-day in attacks. [...]

Microsoft has released multiple emergency, out-of-band updates for Windows 10, Windows 11, and Windows Server to fix two issues caused by the January Patch Tuesday updates. [...]

Malicious Chrome extensions on the Chrome Web Store masquerading as productivity and security tools for enterprise HR and ERP platforms were discovered stealing authentication credentials or blocking management pages used to respond to security incidents. [...]

Verizon has begun sending text messages with instructions on how to redeem a $20 account credit for last week's nationwide wireless outage. [...]

Food delivery platform Grubhub has confirmed a recent data breach after hackers accessed its systems, with sources telling BleepingComputer the company is now facing extortion demands. [...]

Verizon has confirmed that yesterday's nationwide wireless outage was caused by a software issue, though the company has not shared additional details about what went wrong. [...]

Verizon Wireless is suffering a massive outage in the US, with customers reporting their phones stuck in SOS mode with no cellular service. [...]

Microsoft has released the KB5073724 extended security update to fix the Patch Tuesday security updates, including 3 zero-days and a fix for expiring Secure Boot certificates. [...]

Today is Microsoft's January 2026 Patch Tuesday with security updates for 114 flaws, including one actively exploited and two publicly disclosed zero-day vulnerabilities. [...]

Instagram says it fixed a bug that allowed threat actors to mass-request password reset emails, amid claims that data from more than 17 million Instagram accounts was scraped and leaked online. [...]

The latest incarnation of the notorious BreachForums hacking forum has suffered a data breach, with its user database table leaked online. [...]