CVE-2026-78514

VendormicrosoftProduct365 apps, microsoft 365, office 2019, office 2021, office 2024, wordDiscoveredSep 8, 2026UpdatedSep 9, 2026

Use after free in Microsoft Office Word allows an unauthorized attacker to execute code over a network.

CVSS v3.1

8.8 HIGH

EPSS

0.82%

probability of exploitation in 30 days

CISA KEV

Not listed

no confirmed exploitation reported

News coverage

sources referencing this CVE

Related IOCs

seen in the same coverage

Intelligence Reports2

2 intelligence reports available

Curated threat research and citations from CrowdStrike, Mandiant, Microsoft, and other sources — unlock with Premium.

EPSS Trend

Sep 10, 2026 → Sep 25, 2026

▲ 0.22pp

0.59% → 0.82% over 2 tracked changes

CVSS v3.1 Detail

Attack VectorNETWORK

Attack ComplexityLOW

Privileges RequiredNONE

User InteractionREQUIRED

ScopeUNCHANGED

ConfidentialityHIGH

IntegrityHIGH

AvailabilityHIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Connections

7 relationships

Timeline

disclosure → media coverage

Sep 8, 2026

Disclosure — published as a CVE record.