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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 security products, including a zero-day vulnerability, and recovered a customized tool used by the attacker to initiate unauthorized withdrawals," Bitget said in a post on X. On September 24, 2026, the cryptocurrency exchange disclosed that threat actors stole $387.5 million from its hot and warm wallets through a series of unauthorized transfers, prompting it to halt all withdrawals temporarily. Close to $1.1 million in cryptocurrency assets have been frozen by Circle, Tether, and NEAR Intents. In a subsequent analysis , Bitget said the attackers exploited the flaw to obtain high-level internal credentials and use them to issue fraudulent withdrawal commands to the wallet system ...

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 exploitation activity across multiple customer environments, said it identified malicious NetScaler authentication events containing attacker-controlled usernames designed to weaponize CVE-2026-88771. CVE-2026-88771 (CVSS score: 9.5) is an improper input validation vulnerability that could allow an unauthenticated attacker to execute arbitrary commands.  The security flaw, along with CVE-2026-88772, was disclosed last week after reports that the Dutch National Cyber Security Centre (NCSC-NL) reportedly sent a pre-notification to organizations in the Netherlands that urged organizations to shut their appliances down, citing active exploitation. As of writing, there are currently no d...

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 command injection flaw that can lead to remote code execution when Simple Network Management Protocol (SNMP) notifications are enabled and the optional zimbra-snmp package is installed. Exploitation of CVE-2026-73570 can be triggered by a specially crafted SMTP request (i.e., email) against exposed Zimbra servers without requiring authentication or user interaction. The vulnerability was patched by Zimbra in July 2026 with the release of version 10.1.20. "Following successful exploitation, observed activity included deployment of JSP web shells and reverse shells, privilege escalation, persistent remote-access tooling, and memory-backed execution," the tech giant said . "Th...

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 feature in trusted artificial intelligence (AI) platforms. Prior campaigns have weaponized shared conversations with AI chatbots and malicious Claude Artifacts to distribute stealer malware and remote access trojans (RATs). Custom GPTs refer to a personalized version of ChatGPT that, as the name implies, allows users to define custom instructions, upload reference files, and enable specific skills to handle unique tasks without any coding. They are hosted on the legitimate ChatGPT website with the Custom GPT name at the top. "In the incidents we saw, victims interacted with an attacker-created Custom GPT, which was programmed to respond to their prompts with a message that includ...

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 are the six most dangerous techniques that should be on every security team's radar in 2026. 1. Phishing for credentials and sessions Modern phishing kits don't just steal passwords — they intercept live sessions. Reverse-proxy adversary-in-the-middle (AiTM) kits like Tycoon2FA, Sneaky2FA, and Evilginx relay credentials and session tokens in real time, bypassing most forms of MFA. These kits are sold as turnkey Phishing-as-a-Service platforms with anti-bot protection, dynamic lure generation, and automated session replay — reducing the barrier to sophisticated phishing to effectively zero. At the same time, phishing delivery has moved well beyond email — attackers deliver link...

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, has targeted government, financial services, technology, education, and legal and professional services sectors. In a post shared on LinkedIn, Charles Carmakal, chief technology officer at Mandiant Consulting, said the targeted intrusions have impacted dozens of organizations, warning of "broad and opportunistic exploitation of CVE-2026-88772 and CVE-2026-88771 by a variety of threat actors in the near term." "Exploitation of CVE-2026-88772 bypasses authentication and triggers an unhandled termination of the NetScaler Packet Processing Engine (NSPPE) to establish initial root-level access," the tech giant said . The attacks have been observed weaponizing the f...

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 January, mostly in the U.S. and U.K. At least one computer was infected, but the number of breached organizations has not been disclosed. Security agencies in the U.S., U.K., Australia, Canada and New Zealand  said in December 2023  that Star Blizzard almost certainly works under Center 18 of Russia's Federal Security Service (FSB). The group has long stolen email passwords by posing as people its targets know. By 2023, it had already used  fake conference and event invitations  as bait, often exchanging messages with a target before sending a malicious link. Microsoft counted at least 13 larger campaigns this year, each with tens to hundreds of emails, on top of ...

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 Security researchers Nir Zadok, Moshe Siman Tov Bustan, and Vitalii Chepurko said in a technical write-up published Monday. These packages have been collectively downloaded 490,000 times, out of which 116,000 occurred in the last 30 days. The names of some of the packages are below - ourin-baileys @nexustechpro/baileys @badzz88/baileys @ostyado/baileys levvleys @vanzxy/baileys @yudzxml/baileys @chatunity/baileys @kelvdra/baileys neuralwhatsapp lilys-baileys @fyxzpediaa/baileys noxleyss @xrelly-stack/bails alipclutch-baileys kurobails eliteprotech-baileys @xayz/baileys chromestaff-baileys @sanzoffc/baileys @s...

Hackers have used a malware family called NeedyMantis to maintain long-term access to networks they had already breached, Microsoft said in a technical analysis. The malware has been seen in a small number of targeted intrusions at telecommunications organizations, universities, medical nonprofits, intergovernmental organizations, and government contractors. Its use goes back to at least October 2025. Microsoft found NeedyMantis while following up on indicators from Kaspersky's investigation into the  supply chain attack on DAEMON Tools . In that attack, official, signed installers for the DAEMON Tools Lite disk image program carried malicious code from April 8, 2026. The developer replaced them with a clean version on May 5. Microsoft tracks the activity tied to that attack as Storm-3069. It says Storm-3069 is one group that uses NeedyMantis, though it has not seen the malware itself spread through a supply chain attack. Defenders can check their networks using the fi...

RatHat's operators build and publish the Android banking trojan and control infected phones from a web console, according to security company Cleafy. Cleafy has  traced nearly 100 deployments  of that console since April 2026. It said this fits a malware-as-a-service model, in which each customer runs a separate copy. The console stores what the malware collects from each phone, including text messages and passwords entered into fake login screens overlaid on banking apps. Its latest version asks Google's Gemini AI model to estimate each victim's bank balance from those messages and sorts the phones into high-value and mid-value groups. Nothing in the samples Cleafy analyzed uses the model to move money. Its role is "deciding which victims are worth an operator's time," the company said. One Console, Three Versions The malware on victims' phones has changed little since late 2025, Cleafy said. The console behind it has been replaced. Samples f...

A domain used as harmless placeholder text showed up in roughly 1,700 repositories. Then somebody registered it and started serving malicious lures. That is the kind of week this was: forgotten assumptions turning into live attack surface. Elsewhere, weak service accounts, old bugs, exposed systems, phishing kits, and strangely easy exploit paths kept doing useful work for attackers. Nothing exotic. Mostly things nobody expected to matter anymore. Here’s the full recap of what mattered this week. ⚡ Threat of the Week Citrix Warns of Actively Exploited NetScaler ADC and Gateway Flaws — Citrix released patches to address multiple vulnerabilities, including CVE-2026-88771 and CVE-2026-88772, that have come under active exploitation. CVE-2026-88771 is an improper input validation vulnerability that could allow an unauthenticated attacker to execute arbitrary commands, while successful exploitation of CVE-2026-88772 could allow for remote code execution or denial-of-service. CISA...

Cybersecurity researchers have disclosed details of a new botnet malware called Carbonato that's targeting exposed Docker daemons to deploy an open-source artificial intelligence (AI) agent framework called Hermes Agent . "The implant installs the framework unchanged, then overwrites its SOUL.md persona file," ThreatDown said . "The 39-line prompt directs it to execute tasks received through Telegram, maintain persistence, and collect credentials." At a high level, the botnet breaks into Docker daemons exposed without authentication on port 2375 and scans neighboring networks every five minutes to propagate further. On each host, it installs Hermes Agent with instructions to follow operators' Telegram commands. The cybersecurity company said it found the operation through an unauthenticated Docker registry that's been publicly accessible since May 2026. The staged data has been found to include details of the botnet and a separate campaign that d...

The Psychedelic Stealer malware distributed via compromised Ukrainian websites using ClickFix-style Cloudflare verification checks is part of a wider malware-as-a-service (MaaS) platform called Lunex . The new findings come from Ontinue, which described the activity as a four-stage attack chain aimed at targeting Ukrainian-speaking users. "The attack chain begins with a fake CAPTCHA page and culminates in the deployment of a fully-featured C2 agent," Ontinue threat researcher Rhys Downing said in a technical report. "The stealer extracts credentials and data from seven Chromium-based browsers, exfiltrates cryptocurrency wallets, and establishes persistent remote filesystem access through a PowerShell-based Native Messaging Host installed within the victim's browser." The infection makes use of bogus MSI installers delivered via ClickFix to trigger a series of actions, including delivering a loader dubbed LunexLoader that's designed to bypass User Ac...

Google is warning of renewed mass exploitation of a known security vulnerability in Oracle PeopleSoft as part of a campaign targeting multiple sectors globally. The ShinyHunters-linked activity involves the weaponization of CVE-2026-35273 (CVSS score: 9.8), a critical security flaw that could result in unauthenticated remote code execution. The vulnerability was first exploited as a zero-day in attacks against academic institutions to conduct reconnaissance, deploy remote access software like MeshCentral agent for persistence, move laterally over SSH, run a shell script to connect via SSH to other internal PeopleSoft machines using known username/password combinations, and steal data. At that time, Google-owned Mandiant said it initiated notifications to over 100 global organizations whose IP addresses matched vulnerable endpoints, most of them located in the U.S. "This new wave of activity stems from UNC6240 modifying its exploit to bypass web application firewall (WAF...

Two actions-cool GitHub Actions have been disabled for a second time after the repositories became accessible last week, months after they were compromised during the May 2026 Mini Shai-Hulud campaign . The affected GitHub Actions are listed below - actions-cool/issues-helper actions-cool/maintain-one-comment Visiting either of the repositories now shows the message: "Access to this repository has been disabled by GitHub Staff due to a violation of GitHub's terms of service. If you are the owner of the repository, you may reach out to GitHub Support for more information." "On September 16, 2026, both repositories became accessible again," Socket researcher Karlo Zanki said . "Their release tags were not cleaned up first. They still point to the malicious content introduced on May 18, so any workflow that references either action by a version tag resumed downloading and executing the payload on its next run." The two GitHub Actions work...

Cybersecurity researchers have flagged a new version of PamStealer that ensures that the main payload can only be recovered using a server-side decryption chain. The latest artifacts, per Jamf Threat Labs, continue to rely on the same JavaScript for Automation (JXA) dropper mechanism, but modify the lure and the delivery method. "Where earlier variants embedded their payload key material directly in the JXA source, it now fetches a purpose-built decryption utility and completes a key exchange with the server before the payload can be unwrapped," security researcher Thijs Xhaflaire said in an analysis. "Without the server's cooperation, the payload cannot be recovered statically." A second major change is the choice of the decoy itself. While previous versions observed in July and August 2026 were observed using fake websites masquerading as Maccy, Scoppr, and Nancy Clipboard, victims are now lured through a bogus website ("wavel[.]app") advert...

This week, the dangerous stuff keeps arriving dressed as something boring. An update. A login box. A search answer. A coding tool. A link you have clicked a hundred times before. That is the thread running through the pile. Trusted paths get poisoned. Old bugs find new jobs. AI tools leak more than expected. Fake prompts look real enough. And some attacks barely need an exploit at all — just one weak setting or one person doing what the screen tells them. Nothing here looks especially dramatic. That is what makes it useful. The threats change every week. Subscribe, and we’ll alert you when each new ThreatsDay Bulletin is out.

The "third-party[.]com" domain, commonly used as a documentation placeholder, has been observed serving a ClickFix lure to Windows browsers while displaying a harmless decoy to other users. "third-party[.]com has been a generic documentation placeholder for years, the same role example.com plays," Manifold Security's Head of Research, Ax Sharma, said . "Unlike 'example[.]com,' third-party[.]com is not IANA-reserved . Anyone could register it, and someone did. Every doc, test, and skill that hard-coded it now points readers at attacker infrastructure." As of writing, the domain has been marked as malicious and unsafe on both VirusTotal and Google's Safe Browsing list . ClickFix is a social engineering attack technique in which either malicious or legitimate-but-compromised websites display error messages, browser alerts, or CAPTCHA verification prompts, tricking users into copying and executing hidden commands via the Windows Run d...

An active ClickFix campaign has been observed compromising legitimate Ukrainian business websites to inject bogus Cloudflare verification pages and trick victims into downloading a previously undocumented information stealer called Psychedelic . "When a visitor interacts with the page, the lure copies a Windows Installer command to the clipboard and instructs the visitor to paste it into the Windows Run dialog," Arctic Wolf Labs said in a technical report shared with The Hacker News. The ClickFix chain uses an "msiexec.exe" command to fetch a Windows MSI installer that's used to deliver the stealer malware. The malicious tool is designed to harvest browser passwords, account tokens, and cryptocurrency-wallet data, set up scheduled-task persistence, and contact a command-and-control (C2) server for additional tasking. Some of the compromised websites include a hair-treatment clinic, a scale-model manufacturer, a specialist bookseller and publisher, a psy...

The logistics sector has become the target of a new malicious cyber campaign that distributes an Android spyware codenamed Corp MDM . According to Have I Been Squatted, the campaign uses fake Google Play pages branded as CEVA and TKW Logistics to distribute an Android Package Kit (APK) file that's dressed up as a system service. The delivered app has the package name "com.corp.mdm" Corp MDM is a "compact surveillance implant designed to exfiltrate newly received SMS content, divert calls, and maintain a hidden foreground service," security researcher Ben Folland said . The malware has been described as narrow by design, lacking in spyware functions typically observed in commercial Android spyware. It's suspected that the threat actor behind the campaign used artificial intelligence (AI) during the development phase, given the presence of bugs that interfere with its capabilities. In addition, the activity is said to be part of a broader campaign t...