Cisco Patches CVE-2026-20230 in Unified CM as Exploit Code Goes Public

Cisco has patched a bug in Unified Communications Manager that lets an unauthenticated attacker on the network write files to the box and, from there, climb to root. It is tracked as CVE-2026-20230, and proof-of-concept exploit code is already public.

Claude Code GitHub Action Flaw Let One Malicious Issue Hijack Repositories

A security researcher found a flaw in Anthropic’s Claude Code GitHub Action that let an attacker take over vulnerable public repositories running it, with nothing more than a single opened GitHub issue. Because Anthropic’s own action repo used the same

Agentic AI Is Transforming Defense, But Only Secure IT Infrastructure Will Maximize It

Over the past several weeks, the cybersecurity community has been reminded how quickly frontier and agentic AI in defense networks can challenge our assumptions. When Anthropic’s Claude Mythos model was made available to a limited set of organizations as a

ThreatsDay Bulletin: AI Agents Gone Wrong, Sketchy C2 Tools, ClickFix Tricks, JS Backdoors & 20+ New Stories

It got stupid again. The internet still feels held together with tape. Bad plugins, old bugs, fake tools, trusted apps doing shady things. Same mess, new wrapper. And now the weird stuff is normal. Forums go down and come back

China-Linked TA4922 Expands Phishing Attacks to UK, Germany, Italy, and South Africa

A new China-linked cybercrime group known as TA4922 has expanded its targeting focus to target European organizations in the U.K., Germany, Italy, and South Africa. These efforts have been complemented by a “rapid operational tempo” and a continually evolving malware

FlutterShell Backdoor Spreads to macOS via Malicious Google and YouTube Ads

Cybersecurity researchers have shed light on a macOS malvertising campaign codenamed Operation FlutterBridge that spreads a new backdoor called FlutterShell. According to Palo Alto Networks Unit 42, the campaign is said to be the next stage of a previously reported

Fake Sites Mimicking Open-Source Tools Rank High on Google to Deliver Malware via TDS

Cybersecurity researchers have flagged a large-scale operation that impersonates open-source and freeware projects to funnel unsuspecting users through a Traffic Distribution System (TDS) and deliver malware families like Remus Stealer, AnimateClipper, and the SessionGate framework. “The sites are well-designed and

Hackers Spied on a Stock Exchange Executive’s Outlook Mailbox for Five Months

Unknown attackers spent at least five months inside the Outlook mailbox of a senior executive at a major global stock exchange, copying the inbox out in small, repeated batches and routing it through Dropbox and OneDrive so the traffic blended

CISA Adds Exploited Magento RCE Flaw CVE-2026-45247 to KEV Catalog

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Wednesday added a critical flaw impacting Mirasvit Cache Warmer, a popular Magento full-page cache extension, to its Known Exploited Vulnerabilities (KEV) catalog, following reports of active exploitation in the wild. The

DoJ Disrupts Southeast Asia Crypto Fraud Networks, Freezes $3.8 Million in Assets

The U.S. Department of Justice (DoJ) on Wednesday announced the results of a sweeping action undertaken by government authorities and private sector companies to combat cyber-enabled and cryptocurrency fraud targeting Americans. The “Disruption Week” operation began May 18, 2026, leading