mittelstand - DIESEC

Microsoft Teams Vishing Ransomware Hits in 17 Hours

By Editorial Team | August 4, 2026

A Microsoft Teams vishing ransomware campaign, STAC4749, breached dozens of firms via fake IT-helpdesk calls, encrypting networks within 17 hours.

A Microsoft Teams vishing ransomware campaign has hit dozens of North American organizations since February 2026, using two-minute fake IT-helpdesk phone calls to gain a foothold that, in the fastest confirmed case, ended in full Chaos ransomware encryption within 17 hours of first contact. What Happened Security vendor Sophos tracked the campaign to a financially…

ZEGO Cyberattack Insolvency: A Six-Week Shutdown

By Editorial Team | July 10, 2026

ZEGO cyberattack insolvency is now a real-world case study, not a hypothetical: a 35-year-old German textile finisher in Aschaffenburg has filed for insolvency after a cyberattack in March 2026 halted production for nearly six weeks — and the type of attack that caused it still hasn’t been publicly disclosed. What Happened ZEGO Textilveredelungszentrum GmbH, founded…

OPNsense CVE-2026-57155: Root RCE via GeoIP Alias

By Editorial Team | July 7, 2026

OPNsense CVE-2026-57155 (CVSS 9.9) is a path-traversal flaw in the firewall’s GeoIP alias importer that lets a low-privileged user escalate to full root remote code execution. It is the fifth critical or high-severity OPNsense vulnerability disclosed since May 2026, and it matters disproportionately for German Mittelstand IT teams and MSPs because OPNsense’s free, open-source model…