Microsoft Office Excel
CVE-2026-45459 — Microsoft Excel Security Feature Bypass Vulnerability
Executive Summary
Protection mechanism failure in Microsoft Office Excel allows an unauthorized attacker to bypass a security feature locally.
Overview
3.3
CVSS LOW
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C
ATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
Required
SCOPE
Unchanged
CONFIDENTIALITY
Low
INTEGRITY
None
AVAILABILITY
None
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 2.9
EPSS Score
0.00322
probability of exploitation in the next 30 days
0.2377 percentile - updated 2026-06-21
View on FIRST.org
Affected Products
7 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Microsoft 365 Apps for Enterprise for 32-bit Systems | Click to Run (Security Update) |
Important | Security Feature Bypass | No |
| Microsoft 365 Apps for Enterprise for 64-bit Systems | Click to Run (Security Update) |
Important | Security Feature Bypass | No |
| Microsoft Office 365 for Mac | Release Notes (Security Update) |
Important | Security Feature Bypass | Maybe |
| Microsoft Office LTSC 2024 for 32-bit editions | Click to Run (Security Update) |
Important | Security Feature Bypass | No |
| Microsoft Office LTSC 2024 for 64-bit editions | Click to Run (Security Update) |
Important | Security Feature Bypass | No |
| Microsoft Office LTSC for Mac 2021 | Release Notes (Security Update) |
Important | Security Feature Bypass | Maybe |
| Microsoft Office LTSC for Mac 2024 | Release Notes (Security Update) |
Important | Security Feature Bypass | Maybe |
Patches
2 patches
| Article | Type | Restart |
|---|---|---|
Click to Run |
Security Update | No |
Release Notes |
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
References
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