Microsoft Office
CVE-2026-78524 — Microsoft Office Remote Code Execution Vulnerability
Executive Summary
Out-of-bounds write in Microsoft Office allows an unauthorized attacker to execute code over a network.
Overview
8.8
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
ATTACK VECTOR
Network
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: 7.7
EPSS Score
No EPSS score available for this CVE.
View on FIRST.orgAffected Products
10 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Microsoft 365 Apps for Enterprise for 32-bit Systems | Release Notes (Security Update) |
Important | Remote Code Execution | Unknown |
| Microsoft 365 Apps for Enterprise for 64-bit Systems | Release Notes (Security Update) |
Important | Remote Code Execution | Unknown |
| Microsoft Office 2016 (32-bit edition) | 5002916 (Security Update) |
Important | Remote Code Execution | Unknown |
| Microsoft Office 2016 (64-bit edition) | 5002916 (Security Update) |
Important | Remote Code Execution | Unknown |
| Microsoft Office 2019 for 32-bit editions | Release Notes (Security Update) |
Important | Remote Code Execution | Unknown |
| Microsoft Office 2019 for 64-bit editions | Release Notes (Security Update) |
Important | Remote Code Execution | Unknown |
| Microsoft Office 365 for Mac Important Remote Code Execution None Base: 8.8 Temporal: 7.7 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Unknown Unknown None Microsoft Office LTSC 2021 for 32-bit editions | Release Notes (Security Update) |
Important | Remote Code Execution | Unknown |
| Microsoft Office LTSC 2021 for 64-bit editions | Release Notes (Security Update) |
Important | Remote Code Execution | Unknown |
| Microsoft Office LTSC 2024 for 32-bit editions | Release Notes (Security Update) |
Important | Remote Code Execution | Unknown |
| Microsoft Office LTSC 2024 for 64-bit editions | Release Notes (Security Update) |
Important | Remote Code Execution | Unknown |
Patches
2 patches
| Article | Type | Restart |
|---|---|---|
Release Notes |
Security Update | Unknown |
5002916 |
Security Update | Unknown |
Exploits & PoC
No public exploit or PoC has been linked for this CVE yet. When available, references are sourced from public repositories and may be unverified or non-functional — review carefully before use.
Detection Rules
No public Sigma or Nuclei detection rule has been mapped to this CVE yet. Coverage is concentrated on exploited / high-profile vulnerabilities; check SigmaHQ for updates.
Acknowledgments
yhw & txz
References
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