The vulnerabilities may lead to root access, command execution, bypasses, SQL injection, and remote code execution. The post Cisco Fixes Dozens of Flaws Across FMC, ISE and Nexus Dashboard appeared first on SecurityWeek.
The U.S. Federal Bureau of Investigation (FBI) seized the domains used by NightmareStresser, one of the world's longest-running distributed denial-of-service (DDoS) platforms. [...]
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 at production. TL;DR Exploitation is now the front door. ...
The China-aligned state-sponsored threat actor known as FamousSparrow has been observed deploying a previously unreported backdoor called SparroWocky in attacks targeting multiple countries in Latin America since at least August 2025. "SparroWocky is a modular, C++ backdoor," ESET security researchers Alexandre Côté Cyr and Romain Dumont said in a technic...
MalwareThreat actor
OpenAI on Wednesday disclosed six new instances of "unexpected or concerning model behavior" that took place over the past six months, while sharing a new framework for reporting, tracking, investigating, and disclosing model misalignment in a bid to improve transparency. "As AI systems grow more advanced and more widely deployed, we need to build a broad...
The China-linked espionage group FamousSparrow has been using a new backdoor named SparroWocky in attacks on government organizations in Latin America. [...]
Malware
Microsoft shared a temporary fix on Wednesday for a known issue that prevents Windows 11 users from logging in with valid domain credentials after installing the September 2026 security updates. [...]
The Internet Systems Consortium (ISC) has released BIND 9.20.29 and 9.21.26 to fix fourteen security flaws it disclosed on 16 September in BIND 9, its open-source DNS server software. One of them affects any BIND server that answers DNS-over-HTTPS (DoH). A sender with no credentials can crash the server process, named, with a single request that carries a...
Complementing Zero Trust models, decoys enable organizations to detect, observe, and block malicious activity in their environments. The post CISA Releases Cyber Decoy Guidance to Strengthen Critical Infrastructure Defenses appeared first on SecurityWeek.
Critical
New research from Irregular shows AI agents can retrain and redeploy their own underlying models during routine maintenance tasks. The post AI Agents Can Retrain Own Models Mid-Task, Leaking Secrets and Erasing Refusals appeared first on SecurityWeek.
A security breach at Gyazo, Helpfeel's image-sharing service, exposed about 23.62 million user records, including email addresses and password hashes, the Kyoto-based company said in a notice published Wednesday. It also exposed about 490 million image metadata records, mostly for images from January 2019 or earlier, including the IDs that make up Gyazo i...
Cisco has released security updates to address a maximum-severity Identity Services Engine vulnerability that attackers are actively exploiting in the wild. [...]
Zero-day
Cisco has warned of a fresh maximum-severity security flaw impacting Identity Services Engine (ISE) that has come under active exploitation. The vulnerability, tracked as CVE-2026-76460 (CVSS score: 10.0), could allow an unauthenticated, remote attacker to bypass authentication. "This vulnerability is due to insufficient authentication control on an API e...
Remote, unauthenticated attackers can exploit the vulnerability to bypass authentication via crafted requests. The post Active Exploitation Triggers Emergency Patch for Cisco ISE Zero-Day appeared first on SecurityWeek.
Active exploitationZero-day
The U.S. Department of Justice (DoJ) on Tuesday announced the court-authorized seizure of internet domains associated with a distributed denial-of-service (DDoS)-for-hire service known as NightmareStresser. The domains in question are: nightmare-stresser[.]com and nightmarestresser[.]org. Visitors to the sites are now greeted by a seizure banner that stat...
Anthropic is testing a new personal finance feature called "Claude Money" that will allow you to connect your bank accounts directly to Claude and "understand your money." [...]
CISOs are not waiting for AI to prove its cybersecurity value before investing in the technology. Is it the right move?
Microsoft is investigating reports that the Windows 11 KB5124008 security update is breaking domain trust relationships on some enterprise systems, preventing users from logging in with valid domain credentials. [...]