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Week in review: Compromised Zimbra servers, previously patched Citrix NetScaler flaw exploited
Help Net Security's weekly digest highlights 274 compromised Zimbra servers, Gitea and Citrix NetScaler KEV additions, a PaperCut zero-day, and a suspected Iran-linked power plant attack.
The roundup reports at least 274 internet-facing Zimbra instances compromised via CVE-2026-73570, critical Gitea CVE-2026-60004 added to CISA's KEV catalog after exploitation began, and previously patched Citrix NetScaler flaw CVE-2026-8452 exploited in the wild. It also covers PaperCut NG/MF zero-day attacks, a suspected Iran-linked shutdown of a UK power plant, an FBI seizure of domains tied to a China-linked group that hit NASA, DOJ and the Senate, a cyberattack disrupting Boston Scientific, and the Manchester Airports Group breach. Additional items include Chameleon SEO poisoning phishing, Android car head unit proxy botnet malware, ReliaQuest social engineering by ShinyHunters, fake OpenAI Codex macOS malware, and AI-related workforce and supply chain interviews.
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Ransomware attackers are zeroing in on mid-market companies
Black Kite found mid-market firms were 73% of disclosed ransomware victims in North America and Europe from January 2023 to June 2026.
Black Kite analyzed 13,336 publicly disclosed ransomware and data-extortion incidents with known revenue between January 2023 and June 2026, finding mid-market companies (annual revenue $10M-$1B) accounted for 73% of victims in North America and Europe, consistently between 72% and 75%. Manufacturing was the most affected sector, followed by professional, scientific, and technical services and construction. Of more than 120,000 assessed mid-market organizations, 54.7% had at least one significant patch-management issue on a public-facing system, over a quarter had a known-exploited vulnerability, and nearly one-third had stealer-log credential findings.
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