Latest cybersecurity reporting from selected sources.

LegacyHive Is a Local Privilege Escalation BugThe vulnerability hunter in a feud with Microsoft released yet another Windows zero-day Tuesday as promised, though the touted "bone-shattering" disclosure was stripped down to prevent public exploitation. LegacyHive, exploits a profile-loading race condition to access another user's registry hive.

NightmareEclipse Says Mitigation Can Exhaust Disk Space, Crash AppsMicrosoft's patch for CVE-2026-50656, known as RoguePlanet, has sparked fresh criticism after researcher NightmareEclipse alleged the mitigation can exhaust disk space, crash applications and leak memory, extending a months-long dispute over Microsoft's handling of multiple zero-day disclosures.

Security Researchers Fear Broader Legal Pressure on Bug DisclosuresMicrosoft is pursuing legal action after a researcher publicly released six Windows zero-days and exploit code following a breakdown in coordinated disclosure talks, escalating tensions over vulnerability disclosure, platform moderation and protections for independent security researchers.

Also, Taiwan Rail Hack, Massive DDoS Attack and Karakurt Jail SentenceThis week, Microsoft Edge exposed passwords, Taiwan police make arrests in high-speed rail hack and a 2.45 billion-request DDoS attack. A Karakurt negotiator jailed, North Korean IT worker scams led to prison terms and France detained a teen over a government data breach. Another Ivanti zero-day.

Settlement Is Latest Among Scores of Other MOVEit Lawsuits Still PendingNuance Communications, a Microsoft subsidiary, has agreed to pay $8.5 million to settle class action litigation filed after hackers exploited a zero-day flaw in Progress Software's MOVEit file transfer software in 2023, stealing data belonging to more than a dozen of Nuance's healthcare clients.

Also: Spain Defies Pressure to Eject Huawei, Hackers Leak North Korea Kimsuky DataThis week, Norway said Russian hackers attacked a flood gate, Spain defied pressure to eject Huawei, a cyberattack against the Office of the Pennsylvania Attorney General. Hackers leaked stolen North Korean Kimsuky data, Microsoft patched a Kerberos zero-day and a big Chrome bug bounty.

Over 400 Organizations Breached Via Ongoing ToolShell Attacks, Researchers WarnThe U.S. government agency that maintains and designs America's nuclear weapons was reportedly breached by attackers exploiting zero-day flaws in on-premises Microsoft SharePoint servers, with researchers now counting over 400 victims, including European and Middle Eastern governments.

But Hacking Groups of All Stripes Now Have Access to Exploit Code, Researchers WarnMicrosoft said an attack campaign targeting zero-day vulnerabilities in on-premises SharePoint servers appears to have begun by July 7, tied to three Chinese hack groups. With proof-of-concept exploit code now in the wild, security experts said hackers of all stripes have joined the fray.

Microsoft Issuing Emergency Patches to Combat Authentication-Bypassing AttacksHackers have been exploiting a zero-day vulnerability dubbed "ToolShell" in on-premises installations of Microsoft SharePoint to gain remote access, and steal cryptographic keys and data. As Microsoft rolls out patches, experts warn administrators to also rotate keys, to help eject attackers.

Check Point: 'Stealth Falcon' Exploited WebDAV FlawMicrosoft on Tuesday patched a zero-day vulnerability in WebDAV that was exploited by UAE-linked threat actors as part of an espionage campaign in the Middle East and Africa. Check Point attributed the campaign to the Emirates APT group Stealth Falcon.

Microsoft Researchers Link Turkish Spy Group to Output Messenger Zero-Day HackA Turkish-linked cyberespionage group known as Marbled Dust exploited a zero-day in the Output Messenger Server Manager application to spy on Kurdish military operations in Iraq. Microsoft reported the hack and called for immediate mitigation to block credential theft and malware delivery.

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.

A Confused Update Process Reinstalled Old, Exploitable Windows 10 ComponentsMicrosoft has issued a slew of software updates to patch numerous flaws, including three zero-day vulnerabilities that are already being exploited via in-the-wild attacks. Another fix addresses a prior update that inadvertently reintroduced vulnerable components to Windows 10.

Cryptocurrency Users Targeted in Latest Campaign Involving FudModule RootkitA hacking group tied to North Korea exploited a zero-day vulnerability in the open source Google Chromium web browser to try and steal cryptocurrency, Microsoft said. The attack campaign is the latest to involve a sophisticated North Korean rootkit called FudModule. Google has fixed the flaw.

Lazarus Espionage Group's Sophisticated Malware Evades Antivirus MonitoringNorth Korea's Lazarus hacking team, which focuses on cryptocurrency theft and espionage, has once again been exploiting a zero-day vulnerability in Microsoft Windows to install antivirus-suppressing malware dubbed Fudmodule to aid its intrusions.

Also: Turla Targets European Missions and Google Patches Chrome Zero-DaysThis week, hackers used a Linus backdoor and a Microsoft client management tool; Santander Bank, the Helsinki Education Division, an Australian energy provider and auction house Christie's were breached; hackers targeted European missions in the Middle East; and Google patched a zero-day flaw.

Kaspersky Says It Spotted QakBot Operators Exploiting the Flaw in AprilMicrosoft issued a patch Tuesday for a Windows zero-day vulnerability that security researchers say operators of the QakBot botnet and other hackers actively exploited. The elevation of privilege vulnerability flaw is rated "important" on the CVSS scale.

APT28 Used Microsoft Outlook Zero-Day, Governments SaidThe German and Czech governments on Friday disclosed that Russian military intelligence hackers targeted political parties and critical infrastructure as part of an espionage campaign that began last year. "The EU will not tolerate such malicious behavior," the European Union said in a statement.

Microsoft Fixed Bug in February That Gave Kernel-Level Access to North Korean APTNorth Korea's Lazarus hackers exploited a Windows AppLocker driver zero-day to gain kernel-level access and turn off security tools that could detect the group's bring-your-own-vulnerable-driver exploitation techniques. Microsoft fixed the bug in its February patch dump.

Google Fixes Out-of-Bounds Memory Access Flaw, Microsoft Edge Browser Also AffectedGoogle released an urgent fix for the first zero-day vulnerability of the year in its Chrome web browser, warning the bug is under active exploitation. Google blamed an out-of-bounds memory access flaw in its V8 JavaScript rendering engine. It also affects Microsoft Edge browser.