Latest cybersecurity reporting from selected sources.

CISA confirms BlueHammer (CVE-2026-33825) is now used in ransomware attacks to gain SYSTEM privileges through Microsoft Defender. BlueHammer, tracked as CVE-2026-33825, has moved from proof-of-concept noise to real ransomware attacks in the wild, the US CISA confirms. BlueHammer allows attackers to escalate privileges locally in Microsoft Defender. The vulnerability, along with two other zero-days dubbed […]

CISA confirmed on Monday that ransomware gangs are now exploiting a Microsoft Defender privilege escalation vulnerability, dubbed BlueHammer, that has previously been abused in zero-day attacks. [...]

One was patched almost 14 years ago Crooks are exploiting four Microsoft vulnerabilities - one patched 14 years ago and another tied to ransomware activity - according to America's lead cyber-defense agency, which on Monday gave federal agencies two weeks to patch them.…

Microsoft says the financially motivated cybercrime group has exploited n-day and zero-day vulnerabilities in campaigns predicated on speed.

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has urged government agencies to apply patches for two security flaws impacting Synacor Zimbra Collaboration Suite (ZCS) and Microsoft Office SharePoint, stating they have been actively exploited in the wild

A critical GoAnywhere vulnerability is being exploited by the Medusa ransomware group, says Microsoft

Microsoft on Monday attributed a threat actor it tracks as Storm-1175 to the exploitation of a critical security flaw in Fortra GoAnywhere software to facilitate the deployment of Medusa ransomware

A cybercrime group, tracked as Storm-1175, has been actively exploiting a maximum severity GoAnywhere MFT vulnerability in Medusa ransomware attacks for nearly a month. [...]

Although it hasn't been seen in the wild yet A new ransomware strain dubbed HybridPetya was able to exploit a patched vulnerability to bypass Unified Extensible Firmware Interface (UEFI) Secure Boot on unrevoked Windows systems, making it the fourth publicly known bootkit capable of punching through the feature and hijacking a PC before the operating system loads.…

Warlock ransomware exploits unpatched Microsoft SharePoint vulnerabilities to gain access, escalate privileges, steal credentials, move laterally, and deploy ransomware with data exfiltration across enterprise environments.

Cybersecurity researchers have lifted the lid on the threat actors' exploitation of a now-patched security flaw in Microsoft Windows to deploy the PipeMagic malware in RansomExx ransomware attacks

Ransomware gangs have recently joined ongoing attacks targeting a Microsoft SharePoint vulnerability chain, part of a broader exploitation campaign that has already led to the breach of at least 148 organizations worldwide. [...]

Look over there! Amidst its own failure to fix a couple of bugs now under mass exploitation and being abused for espionage, data theft, and ransomware infections, Microsoft said Monday that it spotted a macOS vulnerability some months ago that could allow attackers to steal private data. Redmond reported the bug to Cupertino, which issued a fix back in March.…

Microsoft said Chinese actor Storm-2603 is deploying Warlock ransomware following the exploitation of vulnerabilities in on-prem SharePoint systems

A Chinese hacking group is deploying Warlock ransomware on Microsoft SharePoint servers vulnerable to widespread attacks targeting the recently patched ToolShell zero-day exploit chain. [...]

Tech Giant Says Threat Actors Are Exploiting a Flaw in Widely-Targeted Windows ToolRansomware threat actors are exploiting a zero-day vulnerability discovered in a highly targeted Windows logging system tool in a campaign in part targeting U.S. IT and real estate sectors, Microsoft confirmed in a Tuesday blog post urging customers to apply available patches.

Microsoft has revealed that a now-patched security flaw impacting the Windows Common Log File System (CLFS) was exploited as a zero-day in ransomware attacks aimed at a small number of targets

Hackers Use Stolen Certificates to Bypass Endpoint Detection and ResponseA Russian-speaking ransomware group has been deploying a malicious Windows PE driver that imitates a legitimate CrowdStrike Falcon driver to bypass endpoint security, warn researchers. The driver disables endpoint detection and response software by stripping process protections.

Threat actors have been exploiting a security vulnerability in Paragon Partition Manager's BioNTdrv.sys driver in ransomware attacks to escalate privileges and execute arbitrary code

Also: VPN Vulnerabilities Attract Hackers, Hackers Use Swiss Mail to Send MalwareThis week, Russia suspected in Balctic Sea cable sabotage, VPNs draw ransomware attackers and Swiss snail mail malware. An AI training company reported a cybertheft of $250,000 and a U.S. space firm reported a breach. Microsoft said it will pay $$$ for AI vulnerabilities and a MFA success story.