CVE-2026-45475 — Microsoft Office Remote Code Execution Vulnerability

Executive Summary

Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

Overview

7.8

CVSS HIGH

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Remote Code Execution

Released Jun 9 2026

Last Updated Jun 9 2026

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.00358 — 0.27483 percentile

NVD CVSS 7.8 HIGH — matches MSRC

CVSS Vector

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

ATTACK VECTOR

Local

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

None

USER INTERACTION

Required

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

High

AVAILABILITY

High

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 6.8

EPSS Score

0.00358

probability of exploitation in the next 30 days

0.27483 percentile - updated 2026-06-21

View on FIRST.org

Affected Products

14 affected products

Product	KB Article	Severity	Impact	Restart Required
Microsoft 365 Apps for Enterprise for 32-bit Systems	`Click to Run (Security Update)`	Important	Remote Code Execution	No
Microsoft 365 Apps for Enterprise for 64-bit Systems	`Click to Run (Security Update)`	Important	Remote Code Execution	No
Microsoft Office 2016 (32-bit edition)	`5002878 (Security Update)`	Important	Remote Code Execution	Maybe
Microsoft Office 2016 (64-bit edition)	`5002878 (Security Update)`	Important	Remote Code Execution	Maybe
Microsoft Office 2019 for 32-bit editions	`Click to Run (Security Update)`	Important	Remote Code Execution	No
Microsoft Office 2019 for 64-bit editions	`Click to Run (Security Update)`	Important	Remote Code Execution	No
Microsoft Office 365 for Mac	`Release Notes (Security Update)`	Important	Remote Code Execution	Maybe
Microsoft Office LTSC 2021 for 32-bit editions	`Click to Run (Security Update)`	Important	Remote Code Execution	No
Microsoft Office LTSC 2021 for 64-bit editions	`Click to Run (Security Update)`	Important	Remote Code Execution	No
Microsoft Office LTSC 2024 for 32-bit editions	`Click to Run (Security Update)`	Important	Remote Code Execution	No
Microsoft Office LTSC 2024 for 64-bit editions	`Click to Run (Security Update)`	Important	Remote Code Execution	No
Microsoft Office LTSC for Mac 2021	`Release Notes (Security Update)`	Important	Remote Code Execution	Maybe
Microsoft Office LTSC for Mac 2024	`Release Notes (Security Update)`	Important	Remote Code Execution	Maybe
Microsoft SharePoint Enterprise Server 2016 5002880 (Security Update) 5002881 (Security Update) Important Remote Code Execution 5002868 5002869 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 16.0.5556.1005 16.0.5556.1002 Maybe None Microsoft SharePoint Server 2019 5002874 (Security Update) 5002876 (Security Update) Important Remote Code Execution 5002870 5002872 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 16.0.10417.20153 Maybe None Microsoft SharePoint Server Subscription Edition	`5002873 (Security Update)`	Important	Remote Code Execution	Maybe

Patches

4 patches

Article	Type	Restart
`Click to Run`	Security Update	No
`5002878`	Security Update	Maybe
`Release Notes`	Security Update	Maybe
`5002873`	Security Update	Maybe

Known Exploits

No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.

Acknowledgments

0ccbbf129444eb66344ccafb92b00df4, Jeongmin Choi, Haein Lee with KAIST Hacking Lab

References

MSRC Advisory MITRE NVD