high CVE-2026-78505, CVE-2026-78509, CVE-2026-78510, CVE-2026-66302
Microsoft Office: several vulnerabilities
NCSC-NL reports several vulnerabilities in Microsoft Office with severity high. Affected: CVE-2026-78505, CVE-2026-78509, CVE-2026-78510, CVE-2026-66302. The full description, affected versions and recommended action are available from NCSC-NL.
What this means for you
The advisory names no specific impact — that is the norm for collective advisories and no reason to relax. Go by the severity and check the original source for which of your versions are affected.
Original source
Insights
More articles
Weekly situation, week 36: 55 advisories, 12 critical
Between 30 Aug and 6 Sep 2026 our sources recorded 55 advisories: 12 critical, 43 high.
Weekly situation, week 35: 75 advisories, 21 critical
Between 23 Aug and 30 Aug 2026 our sources recorded 75 advisories: 21 critical, 54 high.
Weekly situation, week 34: 91 advisories, 9 critical
Between 16 Aug and 23 Aug 2026 our sources recorded 91 advisories: 9 critical, 82 high.
Contact
Reputation takes years. Destruction takes seconds.
Talk to us before somebody else does. The first conversation is free and we reply the same business day.