What's happening in security
Breaches, credential dumps, actively exploited bugs and AI incidents — pulled from 5,639 items across public feeds, Have I Been Pwned and CISA KEV.
Biggest this week
- Westcon-Comstor posts record US$3.37B first-half sales as APAC demand for AI, cloud and cyber accelerates — Reseller News (NZ), 3d ago
- GitHub Octoverse 2026 — Simon Willison (AI), 4d ago
- Binance Suffers Security Breach Affecting $6.3 Billion in Assets, Nearly $3 Billion Frozen — The Hacker News, 2d ago
- Upwind Security Raises $400 Million at $3.8 Billion Valuation — SecurityWeek, 4d ago
- Binance hit by record $6.3 billion crypto hack, scrambles to freeze funds — The Record, 3d ago
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Vijil DART tests AI agents for security flaws and policy violations
Vijil has released Diamond Adaptive Red Teaming for Agents (DART), an automated testing system that finds security vulnerabilities and policy violations in enterprise AI agents. DART employs multiple adversarial agents of its own …
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Hackers exploit critical Atlassian flaw after public PoC release
A critical vulnerability (CVE-2026-21589) affecting multiple Atlassian product families, including Jira, Confluence, and Bitbucket, is being exploited in attacks that do not require authentication. [...]
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CVE-2026-21589: Critical unauthenticated arbitrary file access in Atlassian products
Overview On October 5, 2026, Atlassian published a security advisory for CVE-2026-21589 , a critical arbitrary file access vulnerability affecting eight products: Bitbucket Data Center, Confluence Data Center, Jira Service Managem…
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Atlassian Data Center Flaw Draws Exploitation Attempts Within Two Hours of Public Details
Threat actors have begun to exploit a newly disclosed critical security flaw impacting Atlassian Data Center products that could allow access to sensitive files under certain conditions. The arbitrary file access flaw, tracked as …
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Chrome 155 Update Patches 247 Vulnerabilities
Four critical-severity use-after-free defects were fixed in Chromecast, Browser, Navigation, and Track. The post Chrome 155 Update Patches 247 Vulnerabilities appeared first on SecurityWeek .
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SonicWall fixes pre-auth SSRF flaw in SMA 1000 appliances (CVE-2026-102255)
SonicWall has patched four vulnerabilities in its popular Secure Mobile Access (SMA) 1000 series of appliances, including one (CVE-2026-102255) that could allow remote unauthenticated attackers to direct the appliance to issue req…
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Android’s October 2026 Updates Patch 25 Vulnerabilities
The patches resolve a critical vulnerability in Android’s System component that could lead to privilege escalation. The post Android s October 2026 Updates Patch 25 Vulnerabilities appeared first on SecurityWeek .
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Atlassian Patches Critical Vulnerability Affecting 8 Products
Unauthenticated attackers could exploit the flaw to access specific files in the web application root directory. The post Atlassian Patches Critical Vulnerability Affecting 8 Products appeared first on SecurityWeek .
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Check your X.Org server version because a dozen vulnerabilities have been patched
X.Org fixed 12 security flaws in the X server and Xwayland, with the repairs shipping in xorg-server 21.1.25 and xwayland-24.1.14. Nine of the flaws can lead to arbitrary code execution. The other three can crash the server or dis…
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Ninja Forms plugin flaw exploited to hack WordPress sites
Hackers are exploiting stored cross-site scripting (XSS) vulnerabilities in two unrelated WordPress plugins, Ninja Forms and WPC Product Bundles for WooCommerce, to install backdoors and create rogue admin accounts. [...]
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Atlassian warns of critical file-access flaw in Jira, Confluence
Atlassian is warning customers of a critical vulnerability, tracked as CVE-2026-21589, that can be exploited for arbitrary file-access in multiple self-hosted Data Center products, including Confluence, Jira, and Bitbucket. [...]
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'BigDiskBuster' Leaves Microsoft Defender Running While Blocking Updates
Not quite an EDR-killer, but the proof-of-concept cyber technique creates a silent virus detection gap while service runs normally, no exploit required.
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CISO perspectives on managing vulnerability risks in the age of AI
Learn how CISOs can mitigate cybersecurity risks and increase resilience in the age of AI-powered vulnerability management. The post CISO perspectives on managing vulnerability risks in the age of AI appeared first on Microsoft Se…
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CISO perspectives on managing vulnerability risks in the age of AI
Learn how CISOs can mitigate cybersecurity risks and increase resilience in the age of AI-powered vulnerability management. The post CISO perspectives on managing vulnerability risks in the age of AI appeared first on Microsoft Se…
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IBM’s AI-powered vulnerability clearinghouse finds hundreds of Java flaws
The tech giant s announcement underscores the insufficiency of companies existing software supply-chain security practices.
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Atlassian urges immediate patching of critical Data Center file access vulnerability (CVE-2026-21589)
Attackers who know where to look can read files from Atlassian Data Center installations without logging in, the company has warned. About CVE-2026-21589 CVE-2026-21589, a critical arbitrary file access vulnerability with a 9.3 CV…
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LibreOffice and OpenOffice Flaws Let Malicious Spreadsheets Run Code Without Macro Warnings
A malicious spreadsheet can make LibreOffice and Apache OpenOffice run an attacker's code as soon as the file is opened, security researchers have shown. There is no warning first, of the kind either program shows before it runs a…
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Wikimedia Says OpenAI Agents Tried to Compromise Etherpad and Use Wiki Tools as Proxies
The Wikimedia Foundation, which hosts Wikipedia, has confirmed that it has discovered activity by rogue OpenAI agents on its platforms, including unsuccessful efforts to compromise Etherpad, a public note-taking tool, and edit Wik…
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Possible Vulnerability in Apple’s Automatic Reboot
404Media is reporting (alternate link ) that a cyber-weapons arms manufacturer is exploiting a vulnerability in iOS to bypass its automatic reboot security feature. This is the feature that automatically puts an iPhone into a more…
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Dell System Update flaw allows attackers to gain root privileges (CVE-2026-86360)
Dell is urging customers to patch a vulnerability (CVE-2026-86360) in Dell System Update (DSU) that could allow an unauthenticated remote attacker to execute arbitrary code with root privileges. DSU is a tool used by enterprise IT…
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Ontinue extends ION MXDR with managed dark web monitoring
Ontinue has announced the launch of ION for Dark Web Monitoring (DWM), a new managed add-on service that extends ION MXDR to continuously identify exposed credentials, detect brand impersonation attempts, and uncover emerging exte…
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Google Pauses OSS Product Bug Bounty Rewards After Surge in Invalid Automated Reports
Google has stopped accepting product vulnerability reports through its bug bounty program for its open-source software. The change, in effect since October 1, means researchers can no longer submit security flaws in the code of pr…
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How to fix a bug in a fix
Project Zero often works with software vendors to remediate the vulnerabilities we report and provide broader guidance on making software more secure. Some vendors express concern about potential scenarios in which they are unable…
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Critical Atlassian Flaw Lets Unauthenticated Attackers Read Known Files Across 8 Products
A critical flaw in 8 Atlassian Data Center products, which customers host themselves, allows an attacker with no login access to read specific files in each product's web application root directory. The attacker must already know …
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Citrix discloses third actively exploited NetScaler zero-day in less than a week
The vendor was much quicker and consistent in its response to the latest defect, and researchers consider the impact relatively low compared to the previous pair of zero-days. The post Citrix discloses third actively exploited Net…
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Vulnerability in agents from Google and others exposes structural flaw in MCP
Trust gaps in the new protocol spread malicious prompts from one agent to another.
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Rejetto HFS servers now actively scanned for critical RCE flaw
Hackers are actively scanning for a Rejetto HFS weak signing key vulnerability, tracked as CVE-2026-61500, that allows session forgery, account takeover, and remote code execution (RCE). [...]
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US, Australia warn of latest Citrix vulnerability after NetScaler advisory
Citrix confirmed late on Friday that it was “tracking a newly observed issue” related to some customer-managed NetScaler deployments but claimed the problem was not connected to vulnerabilities reported last week that also caused …
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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-…
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CISA flags new exploited NetScaler flaw as attackers crash appliances (CVE-2026-88779)
CISA has added another Citrix NetScaler vulnerability to its Known Exploited Vulnerabilities catalog on Sunday: CVE-2026-88779, a memory overflow bug that may cripple vulnerable NetScaler ADCs and Gateways. Citrix has observed tar…
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New Dell System Update flaw lets hackers gain root privileges
Dell warned customers to patch a critical vulnerability in the System Update (DSU) command-line interface (CLI) deployment tool as soon as possible. [...]
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Citrix issues patch for third exploited flaw in NetScaler
The memory overflow vulnerability could lead to a denial-of-service condition under certain circumstances.
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Google Narrows Open Source Bug Bounty Amid Wave of Invalid Automated Reports
Google has temporarily stopped accepting product vulnerability reports through its Open Source Software Vulnerability Reward Program (OSS VRP). The post Google Narrows Open Source Bug Bounty Amid Wave of Invalid Automated Reports …
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⚡ 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 ac…
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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 intr…
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Exploitation Hits Rejetto HFS Vulnerability Discovered by AI
CVE-2026-61500 allows attackers to recover the session-cookie signing key and gain administrative access and RCE. The post Exploitation Hits Rejetto HFS Vulnerability Discovered by AI appeared first on SecurityWeek .
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Out-of-band Exchange Server update fixes high-severity mailbox access bug (CVE-2026-96940)
Microsoft has pushed out an out-of-band security update for Exchange Server that fixes a high-severity vulnerability (CVE-2026-96940) that may allow authenticated attackers to read emails and attachments of other users in the same…
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Google halts open-source bug bounty program amid AI spam surge
Google has now suspended submissions to its Open Source Software Vulnerability Rewards Program (OSS VRP) after being flooded by AI-generated reports. [...]
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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 ste…
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AI slop submissions force Google to freeze its open-source bug bounty
Google has stopped accepting new product vulnerability reports through its Open Source Software Vulnerability Reward Program (OSS VRP), after a wave of invalid, AI-generated submissions swamped the engineers and open source mainta…
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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 Citrix NetScaler Gateway that has been exploited as part of targeted zero-day attacks. The vulnerability, tracked as CVE-2026-88779, carri…
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Exploitation of Citrix NetScaler Zero-Day Hits Appliances Patched Days Earlier
Citrix has confirmed that a new zero-day vulnerability, CVE-2026-88779, emerged just days after two other exploited flaws were patched. The post Exploitation of Citrix NetScaler Zero-Day Hits Appliances Patched Days Earlier appear…
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Citrix patches NetScaler SAML zero-day exploited in attacks
Citrix has released emergency updates for a new NetScaler denial-of-service vulnerability tracked as CVE-2026-88779 that has been exploited in zero-day attacks, with researchers investigating whether it can also be exploited for r…
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Week in review: Researcher breaks into Microsoft analytics service, NetScaler RCE 0-day exploited
Here’s an overview of some of last week’s most interesting news, articles, interviews and videos: 16-year-old researcher breaks into Microsoft analytics service with access to 17 trillion rows of data A flaw in Titan, an internal …
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CVE-2026-88779: Citrix NetScaler — Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability
Citrix NetScaler ADC (formerly Citrix ADC) and Citrix NetScaler Gateway (formerly Citrix Gateway) contain an improper restriction of operations within the bounds of a memory buffer vulnerability that could allow for a denial of se…
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Fortra Patches Critical Vulnerabilities in BoKS
The bugs could lead to authentication bypass, shell command execution, and memory corruption. The post Fortra Patches Critical Vulnerabilities in BoKS appeared first on SecurityWeek .
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Frontline Education breach exposes school district employee data
Frontline Education is notifying school districts of a data breach after attackers exploited a vulnerability in third-party software to gain unauthorized access to its systems and steal employee information, including Social Secur…
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Site-Blocking Will Not Defend IP, No Matter the Bill’s Name
There has been a raft of site-blocking bills in the latest Congress, and the latest is called the “Deterring Extraterritorial Foreign Exploitation of Networks Damaging Intellectual Property” aka the “ DEFEND IP Act .” The problem …
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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 - …
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Kiteworks & Citrix Incidents Show Challenges of Zero-Day Response
One company told customers to power down its data-protection platform during a nine-hour window, while the other remained mum on reported attacks prior to releasing a patch for its product.
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