Atlassian Data Center CVE-2026-21589 exploited within hours of PoC; BitB phishing targets AI ad portals; ShinyHunters member arrested
This SentinelOne weekly roundup (Week 41, 2026) covers law enforcement actions, a phishing campaign and an actively exploited vulnerability. The most urgent item is CVE-2026-21589, a critical (CVSS 9.3) unauthenticated arbitrary file access flaw in Atlassian Data Center products. Exploitation attempts began about two hours after a public …