JPCERT warns of active exploitation of July 2026 Microsoft SharePoint vulnerabilities
JPCERT/CC issued advisory AT260020 on July 15, 2026 (updated July 31) highlighting that several Microsoft SharePoint flaws – including CVE‑2026‑58644 and CVE‑2026‑50522 – are already being exploited in the wild. The notice urges immediate patching via Microsoft Update and warns that SharePoint Server 2019/2016 support ended on July 14, 2026.