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New Linux Kernel Flaw Gives ARM64 KVM Guests Read-Write Access to Host Memory

A new flaw in the Linux kernel's KVM virtualization code for ARM64 processors can leave a freed piece of host memory exposed to a guest virtual machine on hosts with nested virtualization enabled. The bug, tracked as CVE-2026-89775, allows a guest to read and write host kernel memory, and the researcher who found it says it can be used to escape the guest and run code on the host machine.

Malicious B-tree NPM Package Accumulates Millions of Downloads

Posing as the legitimate sorted-btree package, indexed-btree hides a malware trigger in its prototype method. The post Malicious B-tree NPM Package Accumulates Millions of Downloads appeared first on SecurityWeek.

SharePoint Flaw Initially Listed as Spoofing by Microsoft Enables Authenticated RCE

A SharePoint Server vulnerability that Microsoft initially classified as a spoofing flaw with a CVSS score of 6.5 actually enables authenticated remote code execution, according to full technical details published today by Viettel Cyber Security researcher Dinh Ho Anh Khoa. The flaw, CVE-2026-65660, affects SharePoint Server 2016, 2019, and Subscription Edition. Patches have been

CSuite Targets US and EU Organizations with Device-Code Phishing and Remote Access

ANY.RUN researchers investigated CSuite, a phishing and remote-access operation that combines credential theft, Microsoft 365 session hijacking, and the abuse of legitimate management tools. The campaign showed a strong US focus, with 51% of sessions from the United States. By blending trusted business services with legitimate remote-access software, CSuite can give attackers both account and […] The post CSuite Targets US and EU Organizations with Device-Code Phishing and Remote Access appeare…

Proofpoint Stops the Attacks Traditional Defenses Miss in the AI Era

Proofpoint Breaks Down the Divide Between Data Security and AI Security with the Industry’s First Unified Agentic System

Shai-Hulud Attack Nips Cyber-Firm CrowdSec's GitHub Data

Threat actors stole the contents of 170 private repositories using an OAuth token stolen from a former employee's computer through the TanStack npm supply chain attack.

WordPress Patches ‘Click2Shell’ Vulnerability

The bug lets attackers automatically install and preview themes and could lead to remote code execution. The post WordPress Patches ‘Click2Shell’ Vulnerability appeared first on SecurityWeek.

Public PoC Exposes Critical Veeam Agent Privilege Escalation

A Veeam Agent flaw lets local users gain SYSTEM privileges. A public PoC is available, raising the risk of exploitation on shared Windows systems. If you’re running Veeam Agent on a Windows endpoint with more than one local user, now’s the time to check the version, not tomorrow. On September 14, 2026, public technical details […]

The Closed Quorum: Inside the first reported autonomous AI C2 implant

CLOSEDQUORUM, a malware binary discovered through Cisco Talos’ CAIRN project, exhibits fully autonomous command and control (C2). It represents a shift in effort displacement for attackers, in which expanding portions of the attack chain can be executed without operator involvement.

Introducing CAIRN: Frontier tracking for AI-integrated malware

Talos is releasing CAIRN, a research toolkit for hunting, classifying, and tracking emerging AI-integrated malware.

New Windows Defender zero-day blocks Microsoft antivirus updates

Over the weekend, security researcher Abdelhamid Naceri (also known as Nightmare Eclipse) released another Microsoft Defender zero-day exploit that blocks antivirus updates. [...]

Malicious npm Package indexed-btree Hid Its Loader in Runtime Code Before Removal

A malicious npm package named "indexed-btree" has been observed hiding its malicious behavior within application code rather than using lifecycle scripts, indicating that threat actors are likely shifting tactics in response to recent security controls. "Indexed-btree is a malicious npm package mimicking the legit sorted-btree package, an ordinary B-tree/indexing utility," Checkmarx said. "

U.S. CISA adds Zyxel flaw to its Known Exploited Vulnerabilities catalog

U.S. Cybersecurity and Infrastructure Security Agency (CISA) adds Zyxel flaw to its Known Exploited Vulnerabilities catalog. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added a Zyxel GS1900 Series Switches flaw, tracked as CVE-2026-7273 (CVSS score of 8.8), to its Known Exploited Vulnerabilities (KEV) catalog. The flaw is a stack-based buffer overflow that could allow attackers […]

Looking for free Robux? Here’s what’s real, and what’s a scam

Fake giveaways, free Robux generators and lookalike login pages all target the same thing – your Roblox account

CISA orders feds to patch Zyxel flaw exploited for data theft

​Attackers are now actively exploiting a high-severity vulnerability in Zyxel GS1900 series switches, according to the U.S. Cybersecurity and Infrastructure Security Agency (CISA). [...]

Japan Dismantles First North Korean Laptop Farm as US and Allies Detail Wider Scheme

The US, Japan, Germany and Australia have published a joint report detailing the scope of North Korea’s WaterPlum campaign. The post Japan Dismantles First North Korean Laptop Farm as US and Allies Detail Wider Scheme appeared first on SecurityWeek.

SideCopy Broadens India Targeting to Academia With ReverseRAT Spear-Phishing

The threat actor known as SideCopy has been observed using spear-phishing lures to target academic institutions in India, expanding their strategic focus beyond government entities. "SideCopy campaign operations typically initiate through spear-phishing campaigns that leverage the abuse of mshta.exe to execute malicious scripts and circumvent standard security protocols," Trellix researchers

Contagious Interview: 30,000 devices infected by a fake job interview

North Korea-linked WaterPlum runs the Contagious Interview campaign, infecting over 30,000 devices using a fake job interview. On September 18, Japan’s National Police Agency, the FBI, the US Department of Defense’s Cyber Crime Center, and intelligence agencies from Australia and Germany published a joint advisory about a group called WaterPlum, better known as Contagious Interview. […]

One Hidden Meta Muse Setting Could Let Attackers Turn the AI Assistant Into a Backdoor

Malware already running on a Mac can quietly take over Meta's Muse assistant and use the broad access its owner granted the app, security researcher Patrick Wardle has shown in a proof-of-concept released on September 21. It works by changing a hidden setting so that when the user taps the microphone and dictates a prompt, the words go to the attacker instead of Meta. The flaw is in

WordPress Comment2Shell Flaw Can Turn Anonymous Comment XSS Into RCE via Admin Session

A new flaw in WordPress core let an anonymous visitor leave a comment that planted a hidden script on the page. If a logged-in administrator later opened that page, the script could run code on the site's server. WordPress fixed the flaw, tracked as CVE-2026-93485 and called "Comment2Shell," on September 17 in version 7.1.1 and told site owners to update right away. There is

Zyxel and Veeam Flaws Under Active Exploitation With Command and SYSTEM Access

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Monday added a now-patched security flaw impacting Zyxel GS1900 series switches to its Known Exploited Vulnerabilities (KEV) catalog, citing evidence of active exploitation. The vulnerability, tracked as CVE-2026-7273 (CVSS score: 8.8), is a stack-based buffer overflow vulnerability that could result in arbitrary operating

ZDI-26-719: Cisco ThousandEyes Virtual Appliance DHCP Client Command Injection Remote Code Execution Vulnerability

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Cisco ThousandEyes Virtual Appliance. Authentication is required to exploit this vulnerability. The ZDI has assigned a CVSS rating of 7.2. The following CVEs are assigned: CVE-2026-20350.

ISC Stormcast For Tuesday, September 22nd, 2026 https://isc.sans.edu/podcastdetail/10104, (Tue, Sep 22nd)

(c) SANS Internet Storm Center. https://isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License.

US Proposes AI Incident Alert System in Talks With China, Bessent Says

Trump has resisted calls to slow down AI development, saying that would help China catch up to U.S. companies. The post US Proposes AI Incident Alert System in Talks With China, Bessent Says appeared first on SecurityWeek.

21st September – Threat Intelligence Report

For the latest discoveries in cyber research for the week of 21st September, please download our Threat Intelligence Bulletin. TOP ATTACKS AND BREACHES Japan’s Digital Agency, which operates the Government Solution Service used by multiple ministries, has confirmed a data breach after attackers exploited a vulnerability in a VPN appliance. Approximately 246,000 records were exposed, […] The post 21st September – Threat Intelligence Report appeared first on Check Point Research.

How AI Agents Can Trigger Runaway Costs for Enterprises

Unbounded consumption is an issue that OWASP currently ranks sixth in its Top 10 for LLM Applications, and it could be an extremely costly one.

BigCommerce alerts merchants of data breach linked to Ribon apps

Ecommerce platform BigCommerce has alerted multiple merchants to data breaches after attackers compromised credentials for third-party Ribon applications and used them to inject malicious scripts into online stores. [...]

Google Fined €403 Million Over Location Data Practices

Ireland’s DPC fined Google €403 million over GDPR violations involving location data, transparency, retention and user control. Ireland’s Data Protection Commission (DPC) just fined Google €403 million, and the case behind it goes back six years, to a set of complaints that never really went away. The DPC launched the investigation in February 2020 after […]

CISA alerts of active exploitation of three Linux kernel flaws

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) is warning that hackers are exploiting three Linux kernel vulnerabilities, one of them rated critical. [...]