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 […]

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

Also: Spanish Hacker Granted Russian Asylum, Microsoft Patches Zero-DaysThis week, a CISA warning, Nest footage in Nancy Guthrie case, Signal phishing. Spanish hacker, Russian asylum. Spanish ministry services offline. BYOVD ransomware. The Conduent breach hit Volvo. Microsoft patched zero-days. ZeroDayRAT targeted devices. The SmarterMail breach. Another Fortinet flaw.

Max-severity OneView hole joins a PowerPoint bug that should've been retired years ago CISA has added a pair of security holes to its actively exploited list, warning that attackers are now abusing a maximum-severity bug in HPE's OneView management software and a years-old flaw in Microsoft Office.…

NTLM Reflection Attack Strikes AgainA three-month old flaw in a network protocol for file sharing used by Microsoft is under active exploitation, warns the U.S. Cybersecurity and Infrastructure Security Agency. The flaw's exploitation bypasses mitigations Microsoft has built over the years to prevent NTLM reflection attacks.

CISA Issues Emergency Directive Requiring Federal Agencies to Fix FlawA vulnerability in Exchange hybrid deployments could allow attackers to escalate privileges and gain administrative access to cloud-based environments. Microsoft said Tuesday there is no evidence of its exploitation and "strongly" recommended installing hot fix updates made available in April.

A threat actor has gained access to Microsoft 365 environments of a small number of customers of Commvault's Metallic service.

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Thursday revealed that Commvault is monitoring cyber threat activity targeting applications hosted in their Microsoft Azure cloud environment

Feds Order Agencies to Patch Critical Flaw in Widely Used Local Government SystemHackers are exploiting a critical vulnerability in Trimble's Cityworks platform, an infrastructure management tool used by governments that enables remote code execution on Microsoft IIS web servers. CISA has ordered federal civilian agencies to patch a critical vulnerability by Feb. 28.

A high-severity flaw impacting Microsoft SharePoint has been added to the Known Exploited Vulnerabilities (KEV) catalog by the U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Tuesday, citing evidence of active exploitation

​CISA has ordered U.S. federal agencies to secure their systems against a recently patched Windows MSHTML spoofing zero-day bug exploited by the Void Banshee APT hacking group. [...]

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added a high-severity Windows vulnerability abused in ransomware attacks as a zero-day to its catalog of actively exploited security bugs. [...]

Affected federal agencies must comb through mails, reset API keys and passwords The US Cybersecurity and Infrastructure Security Agency (CISA) warns that Russian spies who gained access to Microsoft's email system were able to steal sensitive data, including authentication details and that immediate remedial action is required by affected agencies.…

US Cyber Defense Agency Instructs Agencies to Fortify Systems Amid Microsoft BreachThe U.S. Cybersecurity and Infrastructure Security Agency publicly released an emergency directive Thursday requiring impacted federal agencies to take immediate remediation measures amid continued fallout from the Russian state-sponsored hacking of Microsoft that began in late November.

CISA warns that attackers are now exploiting a Microsoft SharePoint code injection vulnerability that can be chained with a critical privilege escalation flaw for pre-auth remote code execution attacks. [...]

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added a security flaw impacting the Microsoft Sharepoint Server to its Known Exploited Vulnerabilities (KEV) catalog based on evidence of active exploitation in the wild

CISA ordered U.S. Federal Civilian Executive Branch (FCEB) agencies to secure their Windows systems against a high-severity vulnerability in the Microsoft Streaming Service (MSKSSRV.SYS) that's actively exploited in attacks. [...]

CISA warns that attackers are now exploiting a critical Microsoft SharePoint privilege escalation vulnerability that can be chained with another critical bug for remote code execution. [...]

The U.S. Cybersecurity & Infrastructure Security Agency has added to its catalog of known exploited vulnerabilities (KEV) three security issues that affect Microsoft devices, a Sophos product, and an enterprise solution from Oracle. [...]

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Wednesday added two security flaws to its Known Exploited Vulnerabilities (KEV) catalog due to active exploitation, while removing five bugs from the list due to lack of adequate evidence