Microsoft has now confirmed that an April 2025 Windows security update is creating a new empty "inetpub" folder and warned users not to delete it. [...]

Microsoft is reporting that its AI systems are able to find new vulnerabilities in source code: Microsoft discovered eleven vulnerabilities in GRUB2, including integer and buffer overflows in filesystem parsers, command flaws, and a side-channel in cryptographic comparison. Additionally, 9 buffer overflows in parsing SquashFS, EXT4, CramFS, JFFS2, and …

Microsoft today released updates to plug at least 121 security holes in its Windows operating systems and software, including one vulnerability that is already being exploited in the wild. Eleven of those flaws earned Microsoft’s most-dire “critical” rating, meaning malware or malcontents could exploit them with little to …

Microsoft says the RansomEXX ransomware gang has been exploiting a high-severity zero-day flaw in the Windows Common Log File System to gain SYSTEM privileges on victims' systems. [...]

Today is Microsoft's April 2025 Patch Tuesday, which includes security updates for 134 flaws, including one actively exploited zero-day vulnerability. [...]

EncryptHub, a notorious threat actor linked to breaches at 618 organizations, is believed to have reported two Windows zero-day vulnerabilities to Microsoft, revealing a conflicted figure straddling the line between cybercrime and security research. [...]

Microsoft has announced that hotpatch updates are now available for business customers using Windows 11 Enterprise 24H2 on x64 (AMD/Intel) systems, starting today. [...]

Microsoft used its AI-powered Security Copilot to discover 20 previously unknown vulnerabilities in the GRUB2, U-Boot, and Barebox open-source bootloaders. [...]

The legacy domain for Microsoft Stream was hijacked to show a fake Amazon site promoting a Thailand casino, causing all SharePoint sites with old embedded videos to display it as spam. [...]

The legacy domain for Microsoft Stream was hijacked to show a fake Amazon site promoting a Thailand casino, causing all SharePoint sites with old embedded videos to display it as spam. [...]

Free unofficial patches are available for a new Windows zero-day vulnerability that can let remote attackers steal NTLM credentials by tricking targets into viewing malicious files in Windows Explorer. [...]

A threat actor known as EncryptHub has been linked to Windows zero-day attacks exploiting a Microsoft Management Console vulnerability patched this month. [...]

Microsoft is investigating an Exchange Online bug causing anti-spam systems to mistakenly quarantine some users' emails. [...]

At least 11 state-backed hacking groups from North Korea, Iran, Russia, and China have been exploiting a new Windows vulnerability in data theft and cyber espionage zero-day attacks since 2017. [...]

​Microsoft has discovered a new remote access trojan (RAT) that employs "sophisticated techniques" to avoid detection, maintain persistence, and extract sensitive data. [...]

Microsoft has reinstated the 'Material Theme - Free' and 'Material Theme Icons - Free' extensions on the Visual Studio Marketplace after finding that the obfuscated code they contained wasn't actually malicious. [...]

Slovak cybersecurity company ESET says a newly patched zero-day vulnerability in the Windows Win32 Kernel Subsystem has been exploited in attacks since March 2023. [...]

Today is Microsoft's March 2025 Patch Tuesday, which includes security updates for 57 flaws, including six actively exploited zero-day vulnerabilities. [...]

Nearly 1 million Windows devices were targeted in recent months by a sophisticated "malvertising" campaign that surreptitiously stole login credentials, cryptocurrency, and other sensitive information from infected machines, Microsoft said. The campaign began in December, when the attackers, who remain unknown, seeded websites with links that downloaded ads from …

Microsoft says a North Korean hacking group tracked as Moonstone Sleet has deployed Qilin ransomware payloads in a limited number of attacks. [...]

​Microsoft has taken down an undisclosed number of GitHub repositories used in a massive malvertising campaign that impacted almost one million devices worldwide. [...]

Broadcom warned customers today about three VMware zero-days, tagged as exploited in attacks and reported by the Microsoft Threat Intelligence Center. [...]

CISA has warned US federal agencies to secure their systems against attacks exploiting vulnerabilities in Cisco and Windows systems. [...]

Microsoft has issued a security bulletin for a high-severity elevation of privilege vulnerability in Power Pages, which hackers exploited as a zero-day in attacks. [...]

Microsoft announced the deprecation of the Location History feature from Windows, which let applications like the Cortana virtual assistant to fetch location history of the device. [...]