Cybersecurity Brief - 2026-09-23

• F5 Patches Critical BIG-IP APM Zero-Day Exploited for Unauthenticated RCE on OAuth Servers: Attackers are exploiting a critical flaw in F5 BIG-IP Access Policy Manager (APM) that lets them run code on a BIG-IP system without logging in, F5 says.

The flaw, CVE-2026-94127, affects only systems in which APM serves as an OAuth authorization server, issuing access tokens to applications. F5 di... (The Hacker News) * Chinese Hackers Exploit Chrome-Windows Zero-Day Chain to Deploy CLEANGULP Malware: A Chinese threat actor codenamed UTA0565 has been observed exploiting the recently disclosed Google Chrome-Microsoft Windows exploit chain as zero-days through fake websites.

The attacks, detected on September 3 and 4, 2026, involved the chaining of two vulnerabilities in Chrome (CVE-2026-85046, CV... (The Hacker News) * Critical Next.js ImageResponse Flaw Can Lead to Server Code Execution via Crafted SVG Input: A new security vulnerability in Next.js could allow attackers to run code on a server via ImageResponse, the feature that generates Open Graph and other social preview images, Vercel said.

The risk applies when an app puts values an attacker controls, such as text read from the request URL, into th... (The Hacker News) * ShinyHunters Claims FBI Breach, Says It Stole Data on Agents and Job Applicants: The cyber extortion group known as ShinyHunters on Tuesday claimed it had breached the U.S. Federal Bureau of Investigation and stolen data belonging to current and former employees at the agency.

"We have compromised the FBI. We hold very sensitive data on almost ALL FBI Agents and individuals who... (The Hacker News) * Check Point Warns of Management Server Zero-Day Exploited in Targeted Attacks: Attackers exploited a previously unknown flaw in Check Point's Security Management Server in a handful of targeted attacks on July 23, the company said.

The flaw, CVE-2026-93616, allows an attacker who can access the server's web service to run scripts on it without logging in. Check Point released... (The Hacker News) * WordPress Issues Patch for Critical Flaw That Can Enable Code Execution on Some Servers: WordPress has fixed a critical flaw in its core software that lets an attacker with no account make a site load a PHP file from outside its theme folders.

On some servers, that can go further, allowing the attacker to run their own code. The fix shipped on September 22 in WordPress 7.1.2, with fixe... (The Hacker News) * Malicious npm Package Poses as Twilio Bug-Bounty Probe, Can Exfiltrate Credentials: Cybersecurity researchers have disclosed details of a malicious npm package named "tw-pkgprobe-7731" that masquerades as a security tool targeting developers integrating Twilio into their applications, while stealthily attempting to harvest sensitive data.

The package, named "tw-pkgprobe-7731," was... (The Hacker News) * Microsoft Takes Down EvilTokens Device-Code Phishing Service Tied to 12,000 Inbox Compromises: Microsoft on Tuesday announced the takedown of the EvilTokens device code phishing service that it said used artificial intelligence (AI) "at every step of the attack chain."

The action, carried out with authorization from the U.S. District Court for the Eastern District of Virginia, involved the e... (The Hacker News) * Critical Bifrost AI Gateway Flaw Lets Attackers Run Commands Without Credentials: A critical vulnerability in Bifrost, an open-source AI gateway that routes requests to more than 20 LLM providers, allows an unauthenticated attacker to run arbitrary commands on the gateway server with a single HTTP request.

The flaw, tracked as CVE-2026-90898 (CVSS score: 9.8), affects all versio... (The Hacker News) * Researcher Drops BigDiskBuster Zero-Day PoC That Blocks Microsoft Defender Updates: A zero-day proof-of-concept tool that stops Microsoft Defender from installing platform and signature updates by filling all available disk space was published on GitHub on September 19.

The tool, called BigDiskBuster, has no patch, no CVE, and no Microsoft advisory. Its author, Abdelhamid Naceri, ... (The Hacker News) * AI Agents Are Rewriting the Rules of Lateral Movement: Security teams have spent decades asking whether an identity has too much access. AI agents raise a harder question: how can we determine which paths an autonomous system can discover, given the access it already has?

A person may try several ways to complete a task. A deterministic application fol... (The Hacker News) * New CVSS 10.0 VeloCloud Orchestrator Flaw Actively Exploited in Certificate-Based Setups: Attackers are exploiting a new flaw in on-premises VeloCloud Orchestrator (VCO), the server that manages the Edge devices in a VeloCloud SD-WAN, Arista said on September 22.

The flaw, tracked as CVE-2026-93952, may allow a remote attacker with no login access to privilege internal functions and aff... (The Hacker News) * DORA Year Two: Can Your SOC Actually See the Attack?: When the Digital Operational Resilience Act (DORA) became enforceable across the European Union in January 2025, it triggered an administrative sprint. Financial entities spent the first year establishing risk governance, assessing third-party service providers, updating contract clauses, and docume... (The Hacker News) * 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 resea... (The Hacker News) * 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... (The Hacker News) * 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 mim... (The Hacker News) * 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.ex... (The Hacker News) * 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 micropho... (The Hacker News) * 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 Sep... (The Hacker News) * 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: ... (The Hacker News) * Fake LastPass Authenticator Installer Abuses Microsoft-Signed Driver to Kill Antivirus and EDR: A fake LastPass Authenticator installer offered on GitHub installs a Windows kernel driver that shuts off antivirus and other security software before a password stealer runs if a victim downloads and runs it, researchers at LastPass and Delphos Labs said on September 17.

Microsoft's own hardware-c... (The Hacker News) * Contagious Interview Campaign Compromises 30,000 Devices, Steals $10.71M in Crypto: The North Korean threat actors behind the Contagious Interview campaign have compromised at least 30,000 devices located in more than 100 countries and siphoned funds or account credentials from over 7,000 cryptocurrency wallets, according to a new joint cybersecurity advisory.

The primary targets ... (The Hacker News) * Google Fined €403 Million Over GDPR Violations Tied to Location Data: Google has been fined €403 million for breaking the EU's data protection law, the GDPR, in the way three of its features handled people's location data from May 2018 to February 2020.

Ireland's Data Protection Commission (DPC), Google's lead regulator in the EU, also ordered the company to make its... (The Hacker News) * ⚡ Weekly Recap: Cisco 0-Day, AI Agent RCE, ClickFix Attacks, ClickFix Surge, and Browser Hijacks: A browser. A plugin. A package. A login screen. Normal stuff. That is basically the problem this week.

The trouble keeps showing up inside things people already trust: code that takes a bad turn, old payloads coming back, exposed systems, weak checks, fake fixes, and attack paths that look almost t... (The Hacker News) * TASK#STOMP PowerShell Backdoor Steals Documents, Wi-Fi Passwords, and Clipboard Data: Cybersecurity researchers have disclosed details of a new campaign dubbed TASK#STOMP that delivers a PowerShell backdoor designed to harvest sensitive data from compromised hosts.

The backdoor "automatically harvests and exfiltrates business documents, watches the filesystem for new files in real t... (The Hacker News) * ClickFix Lures Deploy ChainScript RAT Using Polygon to Rotate C2 Infrastructure: Threat actors are leveraging ClickFix-like lures to deliver a previously undocumented remote access trojan (RAT) called ChainScript.

"ChainScript has appeared under multiple build names, including ComponentTask33, UpdateDigital, HostShared, and OrchidViolet66, while presenting itself as Spotify, Zo... (The Hacker News) * Jade Sleet Linked to Indian IT Provider Breach With FLATROOF and ROOFDECK Backdoors: The North Korean threat actor known as Jade Sleet has been attributed to the compromise of an India-based "much smaller organization" in the information technology (IT) services industry, once again highlighting how the adversary continues to target developers to breach target networks.

Cybersecuri... (The Hacker News) * Claude Opus 5 Helped Researchers Take Over OpenAI Staff Accounts via Chained Flaws: Three researchers at the security firm Hacktron used Anthropic's Claude Opus 5 to chain two flaws and take over the ChatGPT and Codex accounts of several OpenAI employees, then reach an internal OpenAI code repository.

The chain began with a bug in the software that runs OpenAI's public help forum ... (The Hacker News) * Can You Prove a New CVE Is Exploitable Before Attackers Do? Learn How in This Webinar: A new CVE drops. Your scanner finds it. The severity score looks ugly.

But that still does not answer the question that matters: Can it actually be exploited in your environment?

Mythos-class AI is compressing the time between disclosure and working exploitation, while many security programs still... (The Hacker News) * Identity Visibility in 2026: The Foundation of Identity Security: Identity visibility is a starting point for modern identity security, because stolen and misused credentials are among the most frequently reported initial access vectors in breach research, including Verizon's annual Data Breach Investigations Report. This article explains what identity visibility ... (The Hacker News) * SolarWinds Patches ARM Hard-Coded Key Flaw Enabling Unauthenticated RCE: SolarWinds has released security updates to address a high-severity flaw in Access Rights Manager (ARM) that, if successfully exploited, could lead to an unauthenticated remote code execution vulnerability.

The vulnerability, tracked as CVE-2026-28326, is rated 8.8 out of 10.0 on the CVSS scoring s... (The Hacker News) * Critical Pre-Auth RCE in Orkes Conductor Workflow Platform Exploited in the Wild: A critical vulnerability impacting Orkes Conductor is being actively exploited in the wild, according to Fortinet.

The vulnerability in question is CVE-2026-58138 (CVSS v3.1 score: 9.8/CVSS v4 score: 9.3), which relates to a case of unauthenticated remote code execution.

"Orkes Conductor 3.21.21 b... (The Hacker News) * Google Gemini Broke Into Real Company Systems After Security Test Domain Mix-Up: Google's Gemini model has become the latest artificial intelligence (AI) system to access the internet and break into other companies during a cybersecurity evaluation. The development was first reported by The Wall Street Journal.

The incidents occurred in May 2026 as part of a test run conducted ... (The Hacker News) * CrowdSec Says TanStack npm Attack Led to Copy of 170 Private GitHub Repositories: An attacker copied about 170 of CrowdSec's private GitHub repositories on May 22 using the account of an employee who had just left, CrowdSec said on September 18.

The French security company had kept his GitHub access open. CrowdSec says his laptop was compromised in May's supply chain attack on T... (The Hacker News) * CISA Flags Three Linux Kernel Vulnerabilities Exploited in the Wild: The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Friday added three security flaws impacting the Linux kernel to its Known Exploited Vulnerabilities (KEV) catalog, citing evidence of active exploitation.

The vulnerabilities are listed below -

CVE-2025-39682 (CVSS score: 9.8) ... (The Hacker News) * Public Exploits Released for Four Linux Kernel Flaws That Enable Local Root: A security researcher has released working exploit code for four Linux kernel flaws that each let a local user gain root, the highest level of access on a machine.

Kernel maintainers have fixed all four over the past few weeks, so a system running an up-to-date kernel is not affected. But the explo... (The Hacker News) * New WordPress Click2Shell Flaw Forces Theme Installs, Can Chain to Code Execution: WordPress today released patches to fix a new set of vulnerabilities in its core software, one of which could allow a crafted web link, opened by a logged-in administrator, to install a theme from the official WordPress.org directory without anyone clicking Install.

The security firm pwn.ai, whose ... (The Hacker News) * Transparent Tribe Deploys New Rust Backdoor Using Private GitHub Repositories for C2: The Pakistan-aligned threat group tracked as Transparent Tribe (aka APT36 and Earth Karkaddan) has been attributed to a fresh set of cyber attacks targeting government and defense entities in India and Afghanistan.

The attacks, per Zscaler ThreatLabz, involve the use of previously undocumented tool... (The Hacker News) * Microsoft Patches CVSS 10.0 Azure AI Foundry Flaw Enabling Unauthorized Privilege Escalation: Microsoft has released fixes for a maximum-severity security flaw in Azure AI Foundry that could be exploited to achieve privilege escalation. No customer action is required.

The vulnerability, tracked as CVE-2026-85889, carries a CVSS score of 10.0.

"Missing authentication for critical function i... (The Hacker News) * An Abandoned CDN Domain Was Re-Registered. Thousands of Sites Still Call It.: In July 2025, someone registered a domain that used to belong to a content delivery network.  The CDN had been wound down years earlier, and the domain it served assets from was allowed to expire. What it had not lost were its callers. Thousands of websites, code repositories, and documentation page... (The Hacker News) * Plugin4Shell Lets Repository Owners Swap Pinned Plugin Code Across Four AI Coding Agents: A flaw in four widely used AI coding agents lets someone who controls a plugin's code repository swap the plugin an agent installs for a malicious one, even when the agent locked that plugin to a specific reviewed version, security firm Air Security said on Thursday.

The firm said Anthropic has pat... (The Hacker News) * WeaselBiscuit Stealer Spreads via 13 npm Packages to Harvest Chrome Extension Storage: Cybersecurity researchers have discovered a cluster of 13 npm packages that have been found to deliver a previously undocumented JavaScript stealer codenamed WeaselBiscuit.

The new malware family, per OpenSourceMalware, exhibits functional overlaps with two malware strains associated with the Democ... (The Hacker News) * Claimed Bug Bounty Hunter Likely Used LLM to Build PhantomRaven npm Stealer: A financially motivated threat actor has been linked to the development and distribution of a JavaScript (JS)-based information stealer known as PhantomRaven via the npm package registry.

"The developer likely wrote the malware using a large language model (LLM), an assessment made with high confid... (The Hacker News) * RatHat Android Malware Abuses ADB to Retain Shell Access After Uninstall: Cybersecurity researchers have flagged a new Android malware called RatHat that's assessed to be operated by China-based threat actors and features an artificial intelligence (AI)-powered system to navigate and control compromised devices.

"Distributed primarily via targeted smishing (SMS/text phi... (The Hacker News) * Critical Check Point Management Flaw Lets Unauthenticated Attackers Run Code as Root: A critical vulnerability in Check Point's Security Management and Log Servers could allow an attacker without login credentials to run code as root on those servers over the network.

The Security Management Server is the system that controls firewall policy and administrator access. Check Point has... (The Hacker News) * ThreatsDay: Self-Rewriting Agents, 800+ Flaws Patched, Insider SIM Swaps and 22 More New Stories : Attackers keep finding new keys. The funny part is that defenders keep inventing where to store them.

This week, those keys sit in AI tools, exposed services, old bugs, weak logins, and software sold like a monthly subscription. Some attacks use new tricks. Others just reuse what was already lying ... (The Hacker News) * Critical Docker Sandboxes Flaw Lets Malicious Guest Code Read and Modify macOS Host Files: Malicious code running inside a Docker Sandboxes virtual machine on macOS could escape the project directory shared into it and read or change files anywhere else on the host, Docker warns in a security announcement on September 15.

The escape runs with the rights of the host account that runs the ... (The Hacker News) * Iran-Linked Handala Hack Tied to HEAVYGRAM Telegram Backdoor That Can Steal Passwords: The Iran-linked "hacktivist" persona known as Handala Hack has been attributed to a Telegram-based surveillance backdoor called HEAVYGRAM and a Delphi-based utility known as CRUDEEXCLUDE.

"HEAVYGRAM offers builtin commands supporting remote command execution, system, network and process information... (The Hacker News) * Critical Unbound DNSSEC Validator Flaw Could Allow RCE via a Malicious DNS Zone: Every release of the Unbound DNS resolver before 1.26.1 has a critical heap overflow in its DNSSEC validator, maintainer NLnet Labs said in an advisory on Wednesday.

An attacker who controls a malicious zone and queries a vulnerable resolver can trigger it, enabling remote code execution.

Unbound ... (The Hacker News) * CISO's Expert Guide to Agentic Pentesting for Websites: Attackers now weaponize new vulnerabilities in about five days (Mandiant, part of Google Cloud). The median organization takes 43 days to patch one (Verizon DBIR 2026). A new free guide explains how autonomous AI agents are closing that gap, and what security leaders must demand before pointing one ... (The Hacker News)