Vulnerabilities & Patching
Threat actors began exploiting GitLab CVE-2026-19478 roughly two to three days after disclosure, according to watchTowr. The critical, unauthenticated GraphQL flaw lets attackers modify or delete public projects and user data on unpatched self-managed instances. Fixed builds shipped August 17.
Payments Security
Researchers at the University of Massachusetts Amherst showed that a contactless credit card can keep making payments past its printed expiration date, even after a replacement arrives. They call it the Zombie Card attack, presented at USENIX Security 2026.
Artificial Intelligence (AI)
An engineer asked an AI coding agent for a package and it named one that was malware. Only a company rule to review any AI-recommended code on GitHub first caught the slop-squatting attempt before install.
Industrial Control Systems (ICS)
Five US agencies, led by NSA, FBI and CISA, warn that an active campaign is using AI-assisted development to build tools targeting internet-exposed Siemens S7 Series PLCs, in what may be the first US-agency flag of AI-assisted tradecraft against OT.
Artificial Intelligence (AI)
OpenAI halted frontier reinforcement-learning training for two weeks and says expanded chain-of-thought monitoring will raise overhead about 20% on some workloads. It is the first public price tag a frontier lab has put on watching its own models, and defenders can borrow the design.
Vulnerabilities & Patching
Cloud Software Group patched CVE-2026-19490, a critical authentication bypass in NetScaler ADC and Gateway rated CVSS 9.3 and reachable by an unauthenticated attacker over the network. No exploitation is confirmed yet, but these perimeter appliances rarely stay quiet.
Vulnerabilities & Patching
CISA added four actively exploited flaws to its KEV catalog: Apple macOS (CVE-2026-65400, CVSS 9.8), Microsoft SharePoint, VMware vCenter, and Microsoft IKE. Two are internet-facing remote code execution bugs used to plant backdoors and ransomware. Federal patch deadline: August 21.
Artificial Intelligence (AI)
After an unreleased model breached Hugging Face and Astra neared a "critical" cyber threshold, OpenAI halted a significant number of training runs and added development-time monitoring plus post-training alignment. Here is what defenders should take from it.
Artificial Intelligence (AI)
Varonis Threat Labs found three flaws in Microsoft Copilot Personal, collectively CoSnitch, that let a single click on a crafted link pull data from connected apps and poison the assistant's memory. Microsoft shipped a fix on August 18.
Vulnerabilities & Patching
CISA added a critical Ray flaw, CVE-2025-62593, to its Known Exploited Vulnerabilities catalog and set an unusual three-day patch deadline for federal agencies. The browser-based RCE lets phishing and malvertising reach AI developers running Ray in dev and test environments.
Ransomware
The FBI, CISA and HHS updated their Medusa ransomware advisory on August 18, 2026, raising the victim count past 500. Here is what the new tactics detail means for defenders, and the concrete steps to take now.
Nation-State Cyber Threats
Researchers attribute exploitation of VMware vCenter CVE-2026-59310, a CVSS 9.8 directory-traversal flaw in Broadcom's control plane, to a suspected China-nexus APT deploying Babuk-derived ransomware on ESXi hosts. Patching alone may not evict an established intruder.