Microsoft Office Word
CVE-2026-78503 — Microsoft Office Word Information Disclosure Vulnerability
Executive Summary
Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose information over a network.
Overview
6.5
CVSS MEDIUM
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
None
AVAILABILITY
None
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 5.7
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 | Information Disclosure | Unknown |
| Microsoft 365 Apps for Enterprise for 64-bit Systems | Release Notes (Security Update) |
Important | Information Disclosure | Unknown |
| Microsoft Office 2019 for 32-bit editions | Release Notes (Security Update) |
Important | Information Disclosure | Unknown |
| Microsoft Office 2019 for 64-bit editions | Release Notes (Security Update) |
Important | Information Disclosure | Unknown |
| Microsoft Office 365 for Mac Important Information Disclosure None Base: 6.5 Temporal: 5.7 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C Unknown Unknown None Microsoft Office LTSC 2021 for 32-bit editions | Release Notes (Security Update) |
Important | Information Disclosure | Unknown |
| Microsoft Office LTSC 2021 for 64-bit editions | Release Notes (Security Update) |
Important | Information Disclosure | Unknown |
| Microsoft Office LTSC 2024 for 32-bit editions | Release Notes (Security Update) |
Important | Information Disclosure | Unknown |
| Microsoft Office LTSC 2024 for 64-bit editions | Release Notes (Security Update) |
Important | Information Disclosure | Unknown |
| Microsoft Office LTSC for Mac 2021 Important Information Disclosure None Base: 6.5 Temporal: 5.7 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C Unknown Unknown None Microsoft Office LTSC for Mac 2024 Important Information Disclosure None Base: 6.5 Temporal: 5.7 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C Unknown Unknown None Microsoft Word 2016 (32-bit edition) | 5002923 (Security Update) |
Important | Information Disclosure | Unknown |
| Microsoft Word 2016 (64-bit edition) | 5002923 (Security Update) |
Important | Information Disclosure | Unknown |
Patches
2 patches
| Article | Type | Restart |
|---|---|---|
Release Notes |
Security Update | Unknown |
5002923 |
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
References
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