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Tenable’s Research Special Operations (RSO) team has been tracking a cluster of agentic AI threat activity since late July 2026. The Taiwan autonomous AI cyber attack confirmed what the cluster data already showed: near-autonomous offensive AI has crossed from theoretical risk to operational reality. Key Takeaways Taiwan's Ministry of Digital Affairs confirmed a near-autonomous AI cyber attack in July 2026 in which autonomous agents mapped 21 connected government systems, compromised 85 accounts, and exfiltrated more than 2,564 personnel records in approximately four days. The Taiwan campaign is part of a broader seven-incident agentic AI threat cluster that also includes JADEPUFFER, which exploited CVE-2025-3248 in the Langflow AI workflow platform for automated database extortion, and knaithe/KnYuan, a Chinese-speaking operator assessed by Unit 42 with moderate confidence, using the same AI agent framework for autonomous vulnerability scanning. The common entry point across all clust

42 Critical 355 Important 1 Moderate 0 Low Microsoft addresses 398 CVEs in the eighth Patch Tuesday of 2026, with three zero-days, including one that was exploited in the wild. Microsoft patched 398 CVEs in its August 2026 Patch Tuesday release, with 42 rated critical, 355 rated as important and one rated as moderate. Our counts omitted two CVEs assigned by MITRE; CVE-2026-6726 and CVE-2026-6727. This month’s update includes patches for: .NET .NET Core .NET Framework AMD Zen Active Directory Certificate Services (AD CS) Application Information Services Azure Active Directory Azure CycleCloud Azure Monitor Agent Azure Storage Explorer Capability Access Management Service (camsvc) Desktop Window Manager Dynamics Business Central GitHub Copilot and Visual Studio Code Microsoft Azure Attestation service and Device Health Attestation Service Microsoft COM for Windows Microsoft Defender for Endpoint Microsoft Digest Authentication Microsoft Dynamics 365 (on-premises) Microsoft Entra Connect

Agentic AI armed attackers first, but it also put real building power in defenders’ hands. Here’s what security practitioners built in two days at Black Hat USA 2026, and how the CyberAgents Exchange keeps that work compounding long after the event. Key takeaways Building defensive cybersecurity tooling no longer requires a developer. Agentic tooling drove the cost of finding and exploiting a vulnerability down to 1990s levels; it also removed the engineering barrier that kept defenders from building the automation they’ve always wanted.   The unglamorous work won the room: triage, reconciliation, toil. Given two days and a requirement to publish, practitioners at SWARM developed agents for prioritization, cross-tool reconciliation, and the unglamorous toil they recognize from their own environments.   All SWARM builds live on the CyberAgents Exchange , source repos attached. Every component built at SWARM is published open source with its source repository attached, so the n

We spent 500+ hours and 40 billion tokens testing Anthropic’s Claude Mythos Preview for Project Glasswing. The takeaway: frontier AI won't run your code security program, but used well, it can make one even stronger. Key takeaways Frontier AI dramatically scales security testing. In one month, Tenable dedicated 11 security experts and more than 40 billion tokens testing Claude Mythos Preview across source code analysis, exploit creation, binary reverse engineering, threat modeling, and dynamic testing.   Human expertise turns frontier AI findings into real risk reduction. More findings don't automatically mean more risk. Mythos Preview surfaced a high volume of findings, but only a fraction proved to be true exposures once Tenable experts determined their reachability, exploitability, and whether existing controls already mitigated them.   Source code access is the defender's asymmetric advantage. Frontier AI is far more powerful when it can read the full source, and that vis

Discover how Tenable Hexa AI closes the gap between exposure management and endpoint patching using intent-driven routines, smart guardrails, and human approval. Key takeaways The problem: A slow handoff between security workflows creates a days-long remediation gap.   The solution: Tenable Hexa AI bridges this gap using intent-driven Routines that automate scoping, deployment, and verification across integrated platforms like Jamf.   Safety and control: Autonomy is governed by the harness built into Tenable One, ensuring the AI operates strictly within defined user permissions and guardrails. Find the exposure. Fix it. Confirm it is gone. Those three steps are rarely executed in a single place, by a single team. Exposure management knows which assets are at risk, while endpoint management actually changes the machine and applies the fix.  Between those two domains of exposure identification and remediation lies a slow, manual handoff and multi-step routine that costs se

Quarterly Report filed 2026-08-04

Tenable spent 30 days running frontier AI models against our own code. It didn’t just find bugs — it proved they’re real, with reproducible exploits. That fundamentally changes code security from ranking potential code defects to a much higher signal focused on the findings that matter. Read on to learn how it reshaped our security team's work, what it cost, and why your program is next. Key takeaways: Now code security starts with proof, not suspicions. Frontier AI instantly builds working exploits and proves which flaws are genuinely dangerous in your source code. Now remediations are confirmed issues, not just ranked lists of maybes.   The durable asset is the harness, not the model. Frontier AI models get the attention, but the durable asset for security teams is the harness: the orchestration and systems around the model that turn suspected flaws into proven, reproducible exploits engineers can act on.   Frontier AI doesn’t replace senior researchers; it makes one as pro

As federal enforcement tightens and states begin stepping in with their own cybersecurity mandates, water and wastewater utilities face a looming wave of hard compliance deadlines, compounded by recent cyber attacks on state water utilities. Key takeaways While the EPA’s national sanitary-survey mandate stalled in court, the agency is aggressively using existing authority, technical guidance, and enforcement alerts to inspect cyber gaps.   Community water systems serving 3,301 to 49,999 people, the vast majority of U.S. systems, must certify their Risk and Resilience Assessments (RRAs) by June 30, 2026, under AWIA 2013.   New York has already finalized binding cybersecurity regulations for wastewater facilities, setting a regulatory template that other states are expected to follow in 2026 and 2027.   Under CIRCIA, utilities will soon be legally required to report significant cyber incidents to CISA within 72 hours and ransom payments within 24 hours.   Federal gran

Canada’s new Critical Cyber Systems Protection Act (Bill C-8) introduces a strict 72-hour cyber incident reporting mandate. Find out how Tenable is helping critical national infrastructure operators bridge the IT/OT divide to ensure full compliance. Key takeaways: Bill C-8 introduces stringent new cyber incident reporting requirements and heavy financial penalties for critical infrastructure operators.   Eliminating network blind spots with a hybrid IT/OT discovery approach, including Safe Active Querying for isolated, hard-to-reach process-control systems, enables operators to establish a required security baseline.   Predictive Vulnerability Priority Rating (VPR) scoring helps you prioritize and focus limited resources on the critical flaws that actually threaten physical safety and uptime.   Advanced multi-detection engines and seamless IT workflow integrations accelerate mean-time-to-respond (MTTR) to help both security teams and operators align with a strict 72-hour

A coordinated cyber attack disrupted water and wastewater systems in at least 12 U.S. states, including more than 30 Minnesota communities. Here is what defenders need to know about the attack so far. This FAQ also details recent cyberactivity targeting internet-exposed PLCs, and how to protect exposed infrastructure. Change log Update August 10: Added Columbus Water Works as a second confirmed Georgia victim. Added a table summarizing publicly confirmed affected entities to date. This is an active situation. Tenable's Research Special Operations team is monitoring developments and will update this FAQ as new information becomes available from federal agencies, state officials, and independent reporting. Click here to review the change log history Update August 10: Added Columbus Water Works as a second confirmed Georgia victim. Added a table summarizing publicly confirmed affected entities to date. Update August 6: This FAQ has been updated to add publicly confirmed affected states an

Material Event filed 2026-07-29