Security News

Ransomware Negotiator Pleads Guilty to BlackCat Scheme

A cautionary tale illustrates why the person negotiating should never be involved with any part of the ransom payment process, experts noted.

Exploits Turn Windows Defender into Attacker Tool

Three proof-of-concept exploits are being used in active attacks against Microsoft's built-in security platform; two are unpatched.

SystemBC C2 Server Reveals 1,570+ Victims in The Gentlemen Ransomware Operation

Threat actors associated with The Gentlemen ransomware‑as‑a‑service (RaaS) operation have been observed attempting to deploy a known proxy malware called SystemBC. According to new research published by Check Point, the command-and-control (C2 or C&C) server linked to SystemBC has led to the discovery of a botnet of more than 1,570 victims. "SystemBC establishes SOCKS5 network tunnels within

22 BRIDGE:BREAK Flaws Expose 20,000 Lantronix and Silex Serial-to-IP Converters

Cybersecurity researchers have identified 22 new vulnerabilities in popular models of serial-to-IP converters from Lantronix and Silex that could be exploited to hijack susceptible devices and tamper with data exchanged by them. The vulnerabilities have been collectively codenamed BRIDGE:BREAK by Forescout Research Vedere Labs, which identified nearly 20,000 Serial-to-Ethernet converters exposed

Surge in Bomgar RMM Exploitation Demonstrates Supply Chain Risk

The critical remote code execution flaw (CVE-2026-1731) in the remote monitoring and management tool can be exploited to spread ransomware and compromise supply chains.

‘Scattered Spider’ Member ‘Tylerb’ Pleads Guilty

A 24-year-old British national and senior member of the cybercrime group "Scattered Spider" has pleaded guilty to wire fraud conspiracy and aggravated identity theft. Tyler Robert Buchanan admitted his role in a series of text-message phishing attacks in the summer of 2022 that allowed the group to hack into at least a dozen major technology companies and steal tens of millions of dollars worth of cryptocurrency from investors.

Ransomware Negotiator Pleads Guilty to Aiding BlackCat Attacks in 2023

A third individual who was employed as a ransomware negotiator has pleaded guilty to conducting ransomware attacks against U.S. companies in 2023. Angelo Martino, 41, of Land O'Lakes, Florida, teamed up with the operators of the BlackCat ransomware starting in April 2023 to assist the e-crime gang in extracting higher amounts as ransoms. "Working as a negotiator on behalf of five different

5 Places where Mature SOCs Keep MTTR Fast and Others Waste Time

Security teams often present MTTR as an internal KPI. Leadership sees it differently: every hour a threat dwells inside the environment is an hour of potential data exfiltration, service disruption, regulatory exposure, and brand damage.  The root cause of slow MTTR is almost never "not enough analysts." It is almost always the same structural problem: threat intelligence that exists

Chinese APT Targets Indian Banks, Korean Policy Circles

China is spying on India's financial sector, for some reason, and it's not putting much effort into it, judging by some stale TTPs.

No Exploit Needed: How Attackers Walk Through the Front Door via Identity-Based Attacks

The cybersecurity industry has spent the last several years chasing sophisticated threats like zero-days, supply chain compromises, and AI-generated exploits. However, the most reliable entry point for attackers still hasn't changed: stolen credentials. Identity-based attacks remain a dominant initial access vector in breaches today. Attackers obtain valid credentials through credential stuffing

Google Fixes Critical RCE Flaw in AI-Based Antigravity Tool

The prompt injection vulnerability in the agentic AI product for filesystem operations was a sanitization issue that allowed for sandbox escape and arbitrary code execution.

NGate Campaign Targets Brazil, Trojanizes HandyPay to Steal NFC Data and PINs

Cybersecurity researchers have discovered a new iteration of an Android malware family calledNGate that has been found to abuse a legitimate application called HandyPay instead of NFCGate. "The threat actors took the app, which is used to relay NFC data, and patched it with malicious code that appears to have been AI-generated," ESET security researcher Lukáš Štefanko said in a report

Google Patches Antigravity IDE Flaw Enabling Prompt Injection Code Execution

Cybersecurity researchers have discovered a vulnerability in Google's agentic integrated development environment (IDE), Antigravity, that could be exploited to achieve code execution. The flaw, since patched, combines Antigravity's permitted file-creation capabilities with an insufficient input sanitization in Antigravity's native file-searching tool, find_by_name, to bypass the program's Strict

A .WAV With A Payload, (Tue, Apr 21st)

There have been reports of threat actors using a .wav file as a vector for malware.

CISA Adds 8 Exploited Flaws to KEV, Sets April-May 2026 Federal Deadlines

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Monday added eight new vulnerabilities to its Known Exploited Vulnerabilities (KEV) catalog, including three flaws impacting Cisco Catalyst SD-WAN Manager, citing evidence of active exploitation. The list of vulnerabilities is as follows - CVE-2023-27351 (CVSS score: 8.2) - An improper authentication vulnerability in PaperCut

ISC Stormcast For Tuesday, April 21st, 2026 https://isc.sans.edu/podcastdetail/9900, (Tue, Apr 21st)

Vercel Employee's AI Tool Access Led to Data Breach

Stolen OAuth tokens, which are at the root of these breaches, "are the new attack surface, the new lateral movement," a researcher noted.

Serial-to-IP Devices Hide Thousands of Old and New Bugs

The OT devices that translate machine talk into Internet-speak are riddled with vulnerabilities and more frequently targeted for attacks, researchers say.

SGLang CVE-2026-5760 (CVSS 9.8) Enables RCE via Malicious GGUF Model Files

A critical security vulnerability has been disclosed in SGLang that, if successfully exploited, could result in remote code execution on susceptible systems. The vulnerability, tracked as CVE-2026-5760, carries a CVSS score of 9.8 out of 10.0. It has been described as a case of command injection leading to the execution of arbitrary code. SGLang is a high-performance, open-source serving

WhatsApp Leaks User Metadata to Attackers

Strangers can infer limited info about you without knowing or messaging you, which could theoretically aid certain kinds of malicious activity.