ClickFix Smuggles Payloads Through Browser Cache to Bypass Windows Run Limits

A new type of ClickFix attack is using compromised websites to trick users into executing a malicious payload cached in a web browser's cache. "Instead of downloading and executing remote payloads like the typical attack pattern, in this attack, the websites pre-fetch a script payload into the...

Microsoft Exchange Flaw Lets Authenticated Attackers Read Other Users' Mailboxes

Microsoft has released out-of-band security updates to address a high-severity flaw in Microsoft Exchange Server that could allow an attacker to escalate privileges under certain conditions. The vulnerability, tracked as CVE-2026-96940 , is rated 8.8 on the CVSS scoring system. "Weak authorizatio...

⚡ Weekly Recap: NetScaler and FortiMail 0-Days, AI Coding Leaks, Spectre v2 and Ransomware Arrests

A blank field. A public repo. One reply to an email. A box left exposed. None of this sounds dramatic, which is partly the problem. This week’s threats keep finding leverage in small things that were easy to overlook. There are actively exploited bugs in the mix, cleaner intrusion paths, smarter...

The Credential Layer Is Expanding Faster Than Security Teams Can See It

Every modern enterprise depends on credentials. This is how humans, systems, and now AI, all connect to data, services, and each other securely. GitGuardian helps secure that credential layer through three connected capabilities: Detect, Remediate, and Prevent. The journey starts with detection,...

Realtek Jungle SDK Exploit Attempts Deliver Cling Botnet With STUN-Based C2

Threat actors have been observed attempting to exploit a now-patched critical security flaw impacting the Realtek Jungle software development kit SDK to deploy a botnet malware called Cling. "Cling is notable not because it introduces a new propagation technique, but because it repurposes ordinar...

Apple Plans Tighter macOS Full Disk Access Controls Over AI Agent Data Access

Apple has announced that it's taking steps to tighten controls around a macOS setting called Full Disk Access FDA due to security risks posed by artificial intelligence AI agents. "Some developers are using Full Disk Access in ways that could put users at risk, exposing everything on their...

Attackers Target Rejetto HFS Flaw That Enables Admin Session Forgery and RCE

A critical security flaw impacting Rejetto HTTP File Server HFS is witnessing active exploitation attempts, according to VulnCheck. The vulnerability in question is CVE-2026-61500 CVSS score: 9.3, a case of session forgery stemming from the use of a weak pseudo-random number generator PRNG that c...

New NetScaler Zero-Day Exploited in Targeted Attacks Can Knock SAML Deployments Offline

Citrix has released security updates for a high-severity security flaw in NetScaler ADC and NetScaler Gateway that has been exploited as part of targeted zero-day attacks. The vulnerability, tracked as CVE-2026-88779 , carries a CVSS score of 8.7 out of 10.0. "CVE-2026-88779 is a memory overflow...

ShinyHunters Suspect Rey Reportedly Detained in Jordan, Helping FBI Identify Group Members

A suspected member of the ShinyHunters digital extortion group, who goes by the online alias "Rey," has been allegedly detained by authorities in Jordan, Reuters reported, citing three people familiar with the matter. Rey, whose real name is Saif ‌al-Din Khader, is said to have been brought into...

China-Aligned TA419 Targets U.S. AI Policy Experts With Microsoft AitM Phishing

A new China-nexus cyber espionage group known as TA419 has been attributed to multiple credential phishing campaigns targeting artificial intelligence AI experts working for U.S. think tanks, universities, and legal sector organizations. The campaigns have impersonated prominent economists and AI...

MI5 Says China’s MSS Funded Research Involving 100+ U.K.-Linked Academics

The U.K.'s domestic intelligence and security agency has warned that more than 100 academics have helped China boost its intelligence gathering efforts on behalf of Beijing's state security service. In a "Security Service Espionage Alert" issued on September 30, 2026, MI5 said the "primary purpos...

Warlock Exploits SharePoint Flaws to Disable Security Tools and Deploy Ransomware

The suspected China-linked threat actor known as Warlock is still continuing to weaponize Microsoft SharePoint vulnerabilities, likely both old and new, in attacks targeting organizations in Portuguese- and Spanish-speaking countries. The activity, observed by the Symantec and Carbon Black Threat...

The State of Cybersecurity in 2026: Key Segments, Insights, and Innovations

Featuring: Cybersecurity is being reshaped by the expansion of cloud infrastructure, AI, distributed systems, and increasingly complex digital environments. As organizations manage more identities, devices, data, and internet-facing infrastructure, security is shifting toward continuous visibilit...

Antino Backdoor Uses Outlook and OneDrive for C2 in China-Nexus Espionage Campaign

Government and policy organizations across Asia have become the target of a new campaign orchestrated by a China-nexus threat actor. The activity, which has targeted government and policy organizations in Taiwan, India, the Philippines, Cambodia, Pakistan, Thailand, and Myanmar, involves the...

GitLab Patches Critical 9.9 AI Gateway Flaw Allowing Command Execution on Self-Hosted Servers

A critical flaw in GitLab's AI Gateway could let a logged-in user with Duo Agent Platform access run commands on the gateway under certain conditions, GitLab said in an advisory. The gateway is the service that connects a GitLab instance to AI models, and only organizations that host their own...

Dell CSM Flaws Enable Unauthenticated Admin Access and Root on Kubernetes Nodes

Dell has released security updates to address multiple critical security flaws in Dell Container Storage Modules CSM that could be exploited by bad actors to take over susceptible systems. The vulnerabilities are listed below - CVE-2026-63688 CVSS score: 10.0 - A missing authentication for critic...

OpenAI Parts Ways With Three Safety Researchers Over Sensitive Information Mishandling

OpenAI has parted ways with three members of its safety team after they leaked private information in violation of company policies, The Wall Street Journal reported. "We have parted ways with three individuals for violating our policies on accessing and handling sensitive company information," a...

Why CISOs Struggle to Answer the Board's Three Hardest Questions, and How to Fix the Report

The quarterly board meeting is two weeks out. The security team is pulling exports from the identity provider, the cloud posture tool, the vulnerability scanner, the SIEM and the EDR console. Someone is building a spreadsheet to reconcile them. Someone else is turning that spreadsheet into slides...

Android 17 Advanced Protection Locks Accessibility Services to Verified Accessibility Tools

Google has announced a new security measure that limits access to Android's accessibility services to verified applications classified as Accessibility Tools when Advanced Protection is enabled. With malicious Android applications abusing the API serving as the main conduit for malware and...

Critical FortiMail Zero-Day Flaw Exploited in Attacks Allows Unauthenticated Arbitrary File Writes

The U.S. Cybersecurity and Infrastructure Security Agency CISA, on Thursday, added a critical security flaw impacting Fortinet FortiMail to its Known Exploited Vulnerabilities KEV catalog, following reports of active exploitation. The vulnerability, tracked as CVE-2026-104286 CVSS score: 9.8,...

Police Arrest 16-Year-Old Suspected of Running KillSec, Seize Ransomware Leak Site and Servers

Police in Spain have arrested a 16-year-old whom investigators suspect of running the KillSec ransomware group. KillSec is accused of stealing data from organizations and threatening to publish it on its leak site unless they paid. The 16-year-old was one of 3 people arrested on September 30, whe...

ThreatsDay: AI-Powered Zero-Day Chain, 543K Live Secrets, Model Inspection RCE and 13 More Stories

This week, the useful words are boring ones: inspect, cache, compile, store, trust. Each sounds harmless. Each can become an attack path when a system does a little more than people expect. A model check can run code. A cache can mix up requests. A public secret can stay useful for years. That is...

WordPress Backdoor Rebuilds Itself After Cleanup Using Files, Database, and Shared Memory

Cybersecurity researchers have shed light on a WordPress compromise in which threat actors deployed multiple persistence mechanisms to ensure that the final payload kept returning without having to infect the site again. The backdoor has been codenamed SC after the "SC" markers present in the...

How Financial Services Companies Can Modernize Their Software Supply Chain

Every security leader at a bank, insurer, or asset manager has had a version of this conversation: Security wants to eliminate a class of vulnerabilities. Engineering explains what it would take to upgrade the platform where they live. Somebody prices out the regression testing. Somebody else...

OpenAI Disrupts Reasoning Extraction Campaign Linked to Moonshot AI Associates

OpenAI on Wednesday said it identified and disrupted a coordinated distillation campaign that was designed to illicitly extract protected reasoning from its artificial intelligence AI models. A "core cluster of the activity," going back to the first week of July, has been attributed to individual...

CISA Adds Exploited Cisco Catalyst SD-WAN Manager Auth Bypass to KEV

The U.S. Cybersecurity and Infrastructure Security Agency CISA on Wednesday added a critical authentication bypass flaw impacting Cisco Catalyst SD-WAN Manager to its Known Exploited Vulnerabilities KEV, following reports of active exploitation. The vulnerability, tracked as CVE-2026-76504 CVSS...

Google Rolls Out Gemini 4 Argon to Trusted Cyber Defenders, Plans Guardrail-Free Version

Google on Wednesday announced its latest frontier artificial intelligence AI model, Gemini 4 Argon , that it said is being rolled out to a set of trusted cyber defenders through its Fairwind Program. "It delivers frontier performance in complex workflows across real-world software engineering,...

Apple CoreGraphics PoC Emerges as WhatsApp PDF Checks Hint at Possible Delivery Path

Security researchers have published the first public proof-of-concept for CVE-2026-86950 , an Apple CoreGraphics flaw Apple says may have been used in attacks against specific targeted individuals. The trigger is a malicious PDF with a crafted embedded font that crashes unpatched iPhones and Macs...

Bitget Confirms Third-Party Zero-Day Behind $387.5 Million Cryptocurrency Theft

Cryptocurrency exchange Bitget on Wednesday confirmed that attackers who stole $387.5 million last week exploited a zero-day flaw in third-party security products, citing ongoing investigation findings from SlowMist. "Their investigation identified malicious activity involving third-party securit...

MetaMask Security Incident Prompts Exit of Affected Ethereum Validators

MetaMask on Thursday said it's responding to what it described as an "ongoing security incident" impacting part of its infrastructure. "We are actively addressing and remediating the issue internally, in coordination with external partners and security advisors," the software cryptocurrency walle...

Citrix NetScaler Post-Exploitation Payload Creates Superuser, Maps Web Shell to CSS-Like URLs

Threat actors have been observed exploiting a critical pre-authentication command injection vulnerability in Citrix NetScaler ADC and NetScaler Gateway to drop web shells and attempt theft of configuration data. LevelBlue's Threat Hunt Operations & Research THOR team, which analyzed the...

Attackers Exploit Zimbra Flaw to Deploy Web Shells and Harvest Authentication Secrets

Threat actors have weaponized a now-patched security flaw in Zimbra Collaboration Suite ZCS to deploy web shells and access mailbox data, according to findings from the Microsoft Security Research team. The attack exploits CVE-2026-73570 CVSS score: 8.9, an unauthenticated operating system comman...

Attackers Abuse MSP360 to Deploy ScreenConnect in Dual-RMM Phishing Attacks

Microsoft has warned of phishing campaigns distributing an installer for the MSP360 Remote Monitoring and Management RMM software under the guise of meeting invitations, PDF-themed lures, software update prompts, and other social-engineering content. "Once executed, the legitimate MSP360 installe...

Cisco Warns of Attackers Exploiting Critical Authentication Bypass in SD-WAN Manager

Attackers are exploiting a new critical zero-day flaw in Cisco Catalyst SD-WAN Manager, the system companies use to manage their Cisco SD-WAN networks, Cisco said in an advisory on September 30. The flaw, CVE-2026-76504 , could allow a remote attacker with no login access to use the Manager's API...

Attackers Abuse ChatGPT Custom GPTs to Deliver RAT via ClickFix Lures

Threat actors are abusing ChatGPT Custom GPTs to disguise them as legitimate product offerings and direct unsuspecting victims to malicious sites that employ ClickFix lures to deliver malware. Huntress, which observed the activity in late September 2026, said it marks the abuse of yet another...

Know Your Enemy: Browser-Based Attack Techniques in 2026

Given that the browser is where business apps are accessed and used, it makes sense that attacks are happening there too. Most breaches today begin in a browser session. Often, they never leave it, with the entire attack chain from initial access to exfiltration playing out in the browser. Here a...

AI Coding Agents Exposed 13,000 Internal Images, Including Billing Records, on GitHub

AI coding agents asked to share screenshots of code changes for review have put internal company images in public GitHub repositories, security company Glow said. Its researchers found more than 13,000 internal images from developers at over 300 organizations, including customer billing records a...

US-Focused CSuite Phishing Steals Microsoft 365 Sessions and Deploys RMM Tools for Remote Access

ANY.RUN researchers traced a US-focused CSuite phishing campaign across 351 sandbox analyses, with 51% of submissions coming from the United States. Technology, manufacturing, government, and consulting organizations showed the highest exposure. By combining Microsoft 365 session theft with...

Attackers Exploit NetScaler Flaw for Root Access, Deploy WHIPSHOT and SLAPSHOT

Unknown threat actors have been observed exploiting a newly patched security flaw in Citrix NetScaler ADC and NetScaler Gateway appliances to target organizations in North America and Europe. The activity, observed by Mandiant Consulting and Google Threat Intelligence Group GTIG in September 2026...

OpenSSL Fixes High-Severity DTLS Flaw That Can Leak Heap Memory Unencrypted

A High-severity OpenSSL flaw can leak heap memory to the other side of a DTLS connection or crash the program, OpenSSL said on September 29 as it released fixes. DTLS, the TLS variant used for UDP traffic, resends a handshake message if no reply arrives before the timer expires. The leak or crash...

Citrix NetScaler CVE-2026-88772 Exploit Details Show Pre-Auth Path to Shellcode Execution

Cybersecurity researchers have disclosed technical details of a recently patched critical security flaw in Citrix NetScaler ADC and Gateway that has come under active exploitation in the wild. The vulnerability, tracked as CVE-2026-88772 CVSS score: 9.5, has been described as a memory overflow bu...

French Tax Data Theft Using Stolen Staff Passwords Went Undetected for Seven Weeks

An attacker used stolen passwords of staff at France's tax administration to take tax data on hundreds of thousands of taxpayers and businesses in June and July. Neither the tax administration nor France's national cybersecurity agency saw the data leave. The attack was not sophisticated, the...

New Spectre-v2 BTR Attack Leaks Linux Memory Despite Existing Defenses

A group of academics from VUSec and Scuola Superiore Sant'Anna have disclosed details of a new Spectre CPU vulnerability variant that affects Just-In-Time JIT engines present in web browsers, language runtimes, and the operating system kernel, across multiple CPU vendors. The new Spectre v2 varia...

Russia's Star Blizzard Targets 100+ Organizations With Fake Event Invites to Deliver Backdoor

Russian state hackers known as Star Blizzard have been using fake event invitations to trick people into installing a backdoor on their Windows computers, according to Microsoft. The campaigns, aimed at people and organizations tied to Ukraine, have affected more than 100 organizations since...

Kiteworks Fixes Critical Flaw Found During Nine-Hour Precautionary Shutdown

Kiteworks on Monday said it worked with federal intelligence authorities over the weekend as it identified and addressed a critical security vulnerability during the scheduled precautionary shutdown. "During the shutdown, this activity led to the discovery of a previously unknown critical...

101 Malicious npm Packages Add Developers' WhatsApp Accounts to Groups Without Consent

Cybersecurity researchers have identified a cluster of 101 npm packages that are used to trap developers into a WhatsApp group subscriber campaign dubbed PhantomSub. "The malicious packages abuse the 'Baileys' WhatsApp open source project to add the victims to groups without their consent," OX...

Dutch Police Arrest 24-Year-Old Amsterdam Man in ShinyHunters Investigation

Dutch authorities have confirmed that they arrested a 24-year-old man from Amsterdam in connection with the ShinyHunters group. "It is true that this month a 24-year-old man from Amsterdam was arrested in an investigation into the hacker group ShinyHunters," the Politie Landelijke Opsporing en...

Official MCP Python SDK Flaw Can Let Malicious Servers Steal OAuth Credentials

A malicious MCP server could trick an application built on the official MCP Python SDK into handing over the OAuth credentials it uses to log in to a real service, the SDK's maintainers said in a security advisory. Affected versions sent the client secret, the authorization code, and the PKCE pro...

OpenAI Shelves GPT-6.1 Astra After Tests Find Deception and Unauthorized Actions

OpenAI on Monday shelved plans to release GPT-6.1 Astra, a next-generation artificial intelligence AI model that was planned for an October launch, after it failed internal safety and alignment audits. The development was first reported by The Wall Street Journal. The move "marks a rare case of a...

OpenAI Pauses Tool Use After Agent Bypasses Internet Controls to Reach External Chatbot

OpenAI said it has made the decision to pause training of its most powerful models after one of its agents during reinforcement learning RL training contacted an external chatbot by exploiting a loophole in its internet-access restrictions. "An agent attempting to complete a search-based training...