Daily Threat Briefing — May 26, 2026

📰 Cybersecurity News Headlines

Top stories from leading cybersecurity publications as of May 26, 2026.

1. Possible ACR Stealer From Page Impersonating Claude, (Tue, May 26th)
   — SANS ISC
   
   Introduction
2. Anthropic’s restricted Claude Mythos model may be coming to Claude Code
   — Bleeping Computer
   
   Anthropic appears to be preparing for the public rollout of the Mythos model, which was announced in April as a restricted model that poses …
3. Microsoft Access VBA, (Mon, May 25th)
   — SANS ISC
   
   Microsoft Access files (Microsoft Office's Database) can contain VBA code.
4. ⚡ Weekly Recap: Linux Flaws, Defender 0-Days, Router Botnets, and Supply Chain Chaos
   — The Hacker News
   
   Monday recap. Same mess, new week. A sketchy dev tool got people pwned, old bugs came back from the dead, and security products somehow need…
5. TeamPCP Supply Chain Campaign: Activity Through 2026-05-24, (Mon, May 25th)
   — SANS ISC
   
   TeamPCP now operates across three package ecosystems in parallel, it reached GitHub's own internal codebase, it trojanize…
6. Netherlands Seizes 800 Servers, Arrests 2 for Aiding Cyberattacks
   — Krebs on Security
   
   Authorities in the Netherlands have arrested the co-owners of two related Internet hosting companies for operating IT infrastructure used by…
7. FBI warns of Kali365 phishing service targeting Microsoft 365 accounts
   — Bleeping Computer
   
   The FBI is warning about the Kali365 phishing-as-a-service platform (PhaaS) that is used to hijack Microsoft 365 accounts by abusing OAuth d…
8. Ghost CMS CVE-2026-26980 Exploited to Hijack 700+ Sites for ClickFix Attacks
   — The Hacker News
   
   Threat actors are exploiting a recently disclosed critical security flaw in Ghost CMS to inject malicious JavaScript code with an aim to fue…
9. The Alert Firehose Finally Meets Its Match
   — The Hacker News
   
   Ask a cybersecurity pro about Network Detection and Response (NDR) and you might still hear "Noisy," "Too much data." But ask the teams runn…
10. Ghost CMS SQL injection flaw exploited in large-scale ClickFix campaign
    — Bleeping Computer
    
    A large-scale campaign is exploiting a critical SQL injection vulnerability (CVE-2026-26980) in Ghost CMS to inject malicious JavaScript cod…
11. Lawmakers Demand Answers as CISA Tries to Contain Data Leak
    — Krebs on Security
    
    Lawmakers in both houses of Congress are demanding answers from the U.S. Cybersecurity & Infrastructure Security Agency (CISA) after KrebsOn…
12. Akamai Joins Growing Chorus of Vendors Betting Big on Secure Enterprise Browsers
    — Dark Reading
    
    When Akamai announced its LayerX acquisition, the company joined a growing list of vendors adding secure enterprise browsers to their produc…

Generated by CryptXNet.ai Threat Intelligence Platform · May 26, 2026 · Sources: The Hacker News, Bleeping Computer, Krebs on Security, Dark Reading, SANS ISC, THN Threat Intel, Unit 42, Security.com