VMware Exploits, Windows 0-Day, MCP Attacks, Browser Hijacks and More – CYBERDEFENSA.MX
The expensive attacks are not always the clever ones.
This week had plenty of proof. Exposed services got hit, old bugs found fresh use, browser sessions became attack paths, and supply-chain problems kept spreading farther than the original compromise. A lot of it came down to access that was already there and defenses that assumed nobody would look too closely.
So, nothing magical. Just a lot of small openings turning into bigger problems. Here’s what stood out.
⚡ Threat of the Week
Suspected China APT Behind Exploitation of New VMware Flaw — A suspected China-nexus APT is assessed to be behind the exploitation of a newly patched security flaw in VMware vCenter. The attacks involve the exploitation of CVE-2026-59310 (CVSS score: 9.8), a severe directory-traversal vulnerability in the VMware vCenter server that could be weaponized by a malicious actor to execute arbitrary code. In at least one compromised instance, the attacks led to the deployment of a backdoor and. a reverse SSH binary, with the attack ultimately leading to the deployment of Babuk-derived ransomware. «Based on the case we investigated, however, we do not believe ransomware was necessarily the primary objective,» QUIRSO said. «To us, its deployment looks more like a smoke screen intended to distract from the underlying intrusion and, importantly, hinder subsequent forensic analysis by encrypting evidence. We therefore see the ransomware activity in this case as potentially serving the broader intrusion rather than being its ultimate objective.»
🔔 Top News
- Apple macOS Flaw Exploited to Drop Crypto Miner — A recently patched security flaw in Apple macOS has come under active exploitation in the wild to deploy a cryptocurrency miner. The vulnerability in question is CVE-2026-65400 (CVSS score: 9.8), a critical authentication issue impacting the Screen Sharing component that could allow an attacker already on the network to authenticate to the built-in remote desktop feature service without valid credentials. The shortcoming was addressed as part of an emergency update in macOS Tahoe 26.6.1, macOS Sequoia 15.7.9, and macOS Sonoma 14.8.9 earlier this month. The Netherlands National Cyber Security Center (NCSC-NL) said it received a report indicating active abuse of the vulnerability across multiple systems on which port 5900 was accessible from the internet. «In all these cases, root had gained access to the affected system and placed a Monero crypto miner,» the agency said.
- Lazarus Exploits New Windows 0-Day — The North Korean threat actor known as Lazarus Group has been attributed to the zero-day exploitation of a newly patched security flaw impacting Microsoft Windows to deliver a never-before-seen backdoor targeting defense and aerospace companies across France, Germany, Brazil, and India. The activity is part of Operation Dream Job, a long-running cyber espionage and social engineering campaign orchestrated by Pyongyang-backed hackers to target professionals worldwide with fake-but-compelling job offers to steal sensitive data and install malware. The attacks have been found to exploit CVE-2026-68820 (CVSS score: 7.0), a privilege escalation flaw affecting Windows Ancillary Function Driver for WinSock («AFD.sys») that was patched by Microsoft as part of its Patch Tuesday updates for August 2026. The attacks have been observed to deliver ForestTiger and a new backdoor called Troy.
- GeoServer Patches Critical Flaw Under Attack — GeoServer has released patches for a critical SQL injection vulnerability that can lead to remote code execution (RCE). The issue, which has yet to be assigned a CVE identifier, has been patched in versions 3.0.1, 2.28.5, and 2.27.6. Per watchTowr, the vulnerability witnessed active exploitation within hours of public disclosure and that it has seen hundreds of attempts originating from a small pool of IP addresses. GeoServer project maintainers told The Hacker News that the flaw was responsibly disclosed and was scheduled to be addressed in their regular release cycle, when details of the flaw became public knowledge last week.
- Amnesia Stealer Goes Beyond Data Theft — A newly discovered macOS stealer family called Amnesia Stealer has been found to target macOS users via ClickFix attacks. The malware, besides stealing data from 16 Chromium-based web browsers as well as other sensitive information, such as passwords, cryptocurrency wallets, Apple Notes, documents, and iCloud Keychain data, includes a streaming module that allows the attacker to interactively control the victim’s web browser. One notable aspect of the stealer is its ability to copy the victim’s Chromium profile, including its authentication state, and load it into a headless browser on the infected system to access the authenticated sessions. The streaming module can duplicate user profiles in Chromium-based browsers, including Google Chrome, Microsoft Edge, Vivaldi, Arc, Opera, and Brave, and establish a WebSocket channel that connects to the operator’s relay and receives commands, such as navigation and mouse clicks. The remote-control component is built using the Chrome DevTools Protocol (CDP). A second WebSocket channel connects to the local headless Chromium instance. «The operator receives a live screencast of the session at around 3fps and can drive it with a full input set: keyboard, mouse, scroll, navigation and tab management,» Jamf said. «In effect, the remote_stream command turns an infected host into a live, operator-driven browser running the victim’s authenticated sessions, which is a materially different level of access from file collection.» Amnesia Stealer is the first documented macOS malware to combine a cloned Chromium profile with CDP-based, real-time remote control to allow interactive access.
- From GhostCommit to GhostSplice — A new attack technique called GhostSplice can sidestep guardrails built around AI coding assistants and parse malicious requests that are split and hidden in a different channel, such as an MCP tool description, a tool result, and a sampling message. Each of these requests is perfectly benign on its own and processed by the assistant without refusing them. «The entire attack rests on the following fact: All three of the tool channels discussed above, together with your files and your own chat, pour into one block of the assistant’s memory,» ASSET Group said. «There does not exist any marking that separates the content based on its respective source. Therefore, the assistant reads it all as a single page.» The attack has been described as a case of cross-channel trust fragmentation. «Due to the absence of a wall between content received from different sources (e.g., different tool channels), the attacker never needs any single one of this content to look dangerous. Instead, the idea is to embed a harmless piece in each source, and the assistant stitches them back into one instruction.»
- Using Chrome DevTools Protocol for Data Theft — New research from SpecterOps detailed a post-exploitation technique that allows Chromium’s CDP protocol to be enabled inside a live Google Chrome or Microsoft Edge process on Windows with an end goal to steal cookies, saved data, and authenticated browser sessions provided an attacker already has code execution permissions on the compromised host. «Cookie protections like ABE and device-bound session cookies make it harder to steal and replay session material, but they do not remove the value of an authenticated browser to adversaries,» SpecterOps said. «Once CDP is enabled inside a Chromium browser, an operator can use the browser context to sidestep those replay protections, access authenticated applications, and collect saved data. Enabling CDP is a reminder that the next evolution of cookie theft may not require stealing the cookie DB and ABE key at all.»
️🔥 Trending CVEs
Bugs drop weekly, and the gap between a patch and an exploit is shrinking fast. These are the heavy hitters for the week: high-severity, widely used, or already being poked at in the wild.
Check the list, patch what you have, and hit the ones marked urgent first — CVE-2026-68820 (Microsoft Windows), CVE-2026-58231 (SAP Commerce Cloud), CVE-2026-48362, CVE-2026-71398, CVE-2026-27302 (Adobe), CVE-2026-20349 (Cisco Secure Firewall Adaptive Security Appliance Software and Secure Firewall Threat Defense), CVE-2026-53413, CVE-2026-53414, CVE-2026-53415 (Zoom), CVE-2026-65400 (Apple macOS), CVE-2026-20337, CVE-2026-20338, CVE-2026-20339, CVE-2026-20345, CVE-2026-20346, CVE-2026-20347, CVE-2026-20348 (ClamAV), CVE-2026-18412 (OpenCart), CVE-2026-66147, CVE-2026-66145 (SonicWall), CVE-2026-6726, CVE-2026-6727 (Trusted Platform Module 2.0 reference implementation), CVE-2026-26035, CVE-2026-70468, CVE-2026-70465 (Fortinet), CVE-2026-65640 (WordPress), CVE-2026-65321 (PyAthena), CVE-2026-43637 (Cornac), CVE-2026-63720 (datamodel-code-generator), an SQL injection vulnerability in GeoServer, and multiple vulnerabilities in WireShark..
🎥 Cybersecurity Webinars
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- AI Can Build Exploits in Minutes. Can Your Security Team Keep Up? → AI is collapsing the time between vulnerability disclosure and attack. Advanced models can now uncover flaws, generate working exploits, and chain them into complete attack paths at machine speed. This webinar presents a practical framework for gaining the visibility, context, and response speed needed to investigate and stop threats before attackers pull ahead.
📰 Around the Cyber World
- Security Flaw in FileRun — VulnCheck disclosed details of CVE-2026-14863 (CVSS score: 8.7), a high-severity operating system command injection flaw in FileRun that could lead to remote code execution. «FileRun’s thumbnail extractors build shell commands by pasting the uploaded file path into a double-quoted string and handing it to exec(), and the filename sanitizer lets $() through, so a file named $(payload).mp4 runs its payload the moment a thumbnail is generated,» security researcher Valentin Lobstein said. «Any authenticated user with upload permission gets code execution; when a public file request weblink exists, so does anyone who knows its token, no account required.» The issue, which affects versions up to and including 2026.2.0, has been fixed in 2026.2.1.
- ClickFix Leads to ACR stealer and GhostPipe — ThreatLocker disclosed an attempted ClickFix attack that employs embedded scripts, steganographic payload extraction, and obfuscation to deploy an advanced iteration of ACR stealer and a secondary payload dubbed GhostPipe. The ClickFix attack originated from a fake CAPTCHA prompt being served on a compromised domain, resulting in the execution of a PowerShell command that downloads an MP3 file, which is then executed using MSHTA to launch a VBScript that’s responsible for running intermediate payloads designed to gather system information and extract from a remotely hosted JPG file a PowerShell script. The script serves as an in-memory module shellcode launcher to deploy ACR Stealer. The malware also contacts a C2 server to fetch secondary payloads, including a PowerShell script called GhostPipe. «This seemingly unknown script performs a proxy-based AiTM attack with the sole purpose of stealing Google logins,» ThreatLocker said. «The methods used are comprehensive and inherently support relaying MFA to successfully capture credentials.»
- Flaw in Citrix NetScaler — Citrix appears to have silently addressed a heap overflow vulnerability in NetScaler that can be exploited to achieve remote code execution. The issue was patched as part of updates released towards the end of June 2026. watchTowr said the vulnerability likely corresponds to CVE-2026-8452, which has been described as a memory overflow vulnerability that could lead to unpredictable or erroneous behavior and denial-of-service when the appliance is configured as a Gateway or an AAA virtual server. The vulnerability, per the threat intelligence company, can be turned into code execution to drop a PHP web shell that can survive the NetScaler packet engine being respawned, and ultimately execute commands with root privileges. Shortly after details of the flaw became public, Defused Cyber said it observed active in-the-wild exploitation efforts two calendar days later.
- Ethereum Malware Loader Goes After Portuguese-Speaking Users — Portuguese-speaking users are the target of a malware loader that uses the EtherHiding technique to dynamically locate attacker infrastructure and distribute additional payloads. «The multi-stage infection chain combines obfuscated JavaScript, Node.js, DLL side-loading, and a malicious Chromium browser extension capable of targeting Chrome and Microsoft Edge to collect cookies and web storage, capture screenshots, monitor browser activity, and receive remote commands,» WatchGuard Threat Lab said. The Israel National Digital Agency (INDA), in its own analysis of EtherHiding, said the technique has been used as a delivery backend, a C2 channel, a victim database, and skimming infrastructure. In another interesting twist, attackers have been found to shift to the BNB Smart Chain testnet, essentially eliminating gas fees and making the whole operation free. «Because writes there are free, unlimited, and leave no financial trail, recent reporting has found malware command-and-control backends running entirely on a testnet,» INDA said.
- Thousands of Exposed Fuel Gauges Dropped from the Internet — BitSight said it observed a dramatic drop in internet-exposed Automatic Tank Gauge (ATG) systems in the U.S., with the number declining by more than half. «From March to June, there was over a 55% drop in exposed IP addresses,» it said. «Globally, exposure fell 49% from that same March peak, with the U.S. accounting for most of the decline. For ten months, from June 2025 through March 2026, the U.S. held a band of roughly 4,300 to 5,300 unique exposed IPs, averaging 4,815 across 2025. Then April fell 27.6% in a single month, May fell another 31.8%, and June continued down. By June, the exposed population was 56% below the March peak.»
- Phantom Enigma Campaign Targets Brazil — An active PhantomEnigma campaign has been observed abusing compromised government infrastructure and fake police-themed documents to target banking and public-sector organizations in Brazil. The phishing messages are presented as official notices and bypass email security filters to deliver a modular Node.js backdoor that collects system data, sets up persistence, and connects to rotating C2 infrastructure. It can also execute JavaScript or deliver stealers, loaders, RMM software, and other malware. Some aspects of the activity overlap with prior reports from Positive Technologies.
- F.B.I. Agent Charged With Unauthorized Crypto Withdrawals — An F.B.I. counterintelligence agent has been charged with illicitly obtaining about $1 million worth of cryptocurrency, largely through unauthorized withdrawals from a criminal target overseas. According to The New York Times, the agent claimed he had begun taking the money in late 2024 or early 2025, and made 10 or 12 withdrawals altogether by making use of a seed phrase to the suspect’s account that the F.B.I. had obtained during its investigation of the individual.
- Ukraine Dismantles Fraudulent Call Centers — Ukrainian authorities disrupted 94 fraudulent call centers during a nationwide operation that involved more than 400 searches and the seizure of thousands of computers, phones, and SIM cards. Per the Ukrainian police, the call centers were associated with schemes relating to callers impersonating bank employees, fraudulent investment services, cryptocurrency platforms, and attempts to gain remote access to victims’ devices or trick them into handing over sensitive data under the guise of suspicious transactions. Some cybercriminals collected personal information about prospective victims and shared or sold those records to other operations. «Call centers were staffed by administrators, operators, and other participants in the schemes, and ready-made conversation scripts, databases of potential victims, special software, and tools for hiding and further withdrawing funds were used,» the police said. During the probe, 3,336 pieces of computer equipment, 1,346 phones, over 5,200 SIM cards, 90 bank cards, access to 20 crypto wallets, and 22 cars were seized. About $2 million, €64,000, cash in hryvnias, a kilogram of bank gold in bars, and jewelry were also confiscated.
- North Carolina Man Sentenced for Cyber Extortion Scheme — Cameron Curry, 27, of Charlotte, North Carolina, was sentenced to 24 months in prison for carrying out an «extensive cyber extortion scheme» against an unnamed D.C.-based international technology company. In March 2026, Curry was convicted of six counts of transmitting or willfully causing interstate communications with the intent to extort a victim company. «Curry misused his position to access the victim company’s personnel and other sensitive corporate records, which he then used to carry out the cyber extortion scheme,» the U.S. Justice Department said. «Curry hatched his extortion scheme after he learned that his contract was not going to be renewed and that he would no longer be employed by the company.»
- ExfilSquad’s Access to Data from 13 Organizations — A new analysis of data samples published by the ExfilSquad data extortion group has confirmed «they have access to sensitive data.» Fortra said the breaches were most likely limited to unauthorized access of D365 instances. «The leading theory on the initial attack vector that enabled exfiltration is misconfigured Microsoft Power Page portals that allowed for public read access,» it said. «The observed leaked data formats are consistent with Microsoft Dataverse exports, suggesting unauthorized read access may have been achieved, and victims found by crawling for misconfigured Microsoft Power Portals or other enumeration techniques.»
- OpenAI Rolls Out Computer History in ChatGPT — OpenAI replaced Chronicle, which builds memories from screen captures to make ChatGPT and Codex more aware of context, with Computer History. «Computer History turns your activity across apps and websites into memories and a timeline that ChatGPT and Codex can reference,» OpenAI said. «You can ask natural questions about recent work, pick up where you left off, understand patterns in how you work, and turn repeated workflows into skills or automations.» Computer History is off by default for ChatGPT Pro, Business, and Enterprise users in the ChatGPT desktop app on macOS. The feature is reminiscent of Microsoft’s controversial Recall, which attracted scrutiny for relying on periodic screenshots to capture and index relevant information. Unlike Chronicle, which also used screenshots, Computer History relies on capturing interactions (e.g., clicks, typing, keyboard shortcuts, app switches, and context) to allow the AI to understand user workflows. «Computer History records interaction events and does not capture your screen or audio,» OpenAI said. «You control which apps and websites contribute, can see and pause collection from the macOS menu bar, and can inspect or delete your history at any time.» That said, it’s worth emphasizing that Computer History files can contain sensitive information. «They are not encrypted by Computer History, and other programs running as your macOS user may be able to access them,» OpenAI cautions. «Protect your Mac account and exclude sources you do not want included.» OpenAI also warned that Computer History increases the risk of prompt injection from content in apps and websites, as the AI system can follow instructions when visiting a website containing malicious instructions. Temporary interaction event files are retained for up to 48 hours before they are deleted. However, they can be used to create memory files that can remain for extended periods of time until users explicitly delete or clear them.
- China-linked LightSpy Activity Detected in Over 13 Countries — The modular implant known as LightSpy has evolved into a broader surveillance tool that’s in use in more than 13 countries and regions, including Singapore, Hong Kong, the Netherlands, Pakistan, Japan, China, Malaysia, Germany, the U.S., Thailand, Indonesia, South Korea, Austria and Turkey, Arctic Wolf Labs said. This includes previously unreported router-focused capabilities along with live router implants in Europe and Africa. «The findings expand the potential impact of the surveillance framework beyond individual devices: router access can provide visibility into every device connected to a home or office network and may persist after phones are replaced, devices are factory-reset, or operating systems are upgraded,» a spokesperson for the company said. LightSpy infrastructure spans several countries, including 117 servers and 35 domains impersonating Asian electronics manufacturers and router-management services. Evidence indicates that LightSpy functions as a commercialized surveillance platform, with customer branding, billing functionality, and a demonstration environment used to market the framework to prospective buyers. The platform is assessed to be the work of a Chinese contractor after one of the operators used the LightSpy administrator’s panel to place an order with KFC using their real name and office address.
- Trivy Supply Chain Attack Exposed 2,500+ Companies — A new analysis from SOCRadar has revealed that 95% of organizations impacted by the LiteLLM supply chain attack earlier this year were exposed before, coinciding with the compromise of the Trivy scanner. «Organizations did not need to install LiteLLM directly to be exposed,» the cybersecurity company said. «The package could arrive through frameworks such as DSPy, MLflow, CrewAI, OpenHands, and Arize Phoenix, while its payload executed at Python startup without requiring a LiteLLM import.» The incident was attributed to a threat actor known as TeamPCP.
- Massive Azure Exfiltration Campaign Exposes Millions of Enterprise Records — An active Microsoft Azure exfiltration campaign is being driven by a threat actor named «TheHatman,» who has «flooded» cybercrime forums with enterprise employee databases. The data is said to have been downloaded directly from the organizations’ Azure/Entra portals using compromised credentials, although the exact intrusion vector remains unknown. The campaign impacts multiple global enterprises across IT services, hospitality, telecommunications, retail, and logistics. Some of them include McDonald’s, TCS, Vodafone, HCL Technologies, Kyndryl, Gap, Hexaware, and Wyndham Hotels. «Judging by the massive size of the organizations impacted, it appears highly likely that this campaign originates from targeted exploitation of Infostealer infections rather than a systemic zero-day vulnerability in Azure,» Hudson Rock said.
Conclusion
That’s the week. Some attacks needed a real exploit. Others just needed an exposed system, a stolen login, or one weak link buried in the stack.
The useful part is knowing which kind you’re dealing with before it becomes your problem. Patch what matters, close what should not be public, and keep an eye on the boring stuff. It keeps winning.
