Microsoft Office Zero-Day (CVE-2026-21509) - Emergency Patch Issued for Active Explo - Printable Version +- Hack Forums (https://hackforums.net) +-- Forum: General Topics (https://hackforums.net/forumdisplay.php?fid=7) +--- Forum: World (https://hackforums.net/forumdisplay.php?fid=445) +---- Forum: News and Happenings (https://hackforums.net/forumdisplay.php?fid=89) +---- Thread: Microsoft Office Zero-Day (CVE-2026-21509) - Emergency Patch Issued for Active Explo (/showthread.php?tid=6319103)

Microsoft Office Zero-Day (CVE-2026-21509) - Emergency Patch Issued for Active Explo - Stanley - Feb 4, 2026 Microsoft Office Zero-Day (CVE-2026-21509) - Emergency Patch Issued for Active Explo Microsoft on Monday issued out-of-band security patches for a high-severity Microsoft Office zero-day vulnerability exploited in attacks. The vulnerability, tracked as CVE-2026-21509, carries a CVSS score of 7.8 out of 10.0. It has been described as a security feature bypass in Microsoft Office. "Reliance on untrusted inputs in a security decision in Microsoft Office allows an unauthorized https://thehackernews.com/2026/01/microsoft-issues-emergency-patch-for.html