CVE-2026-45461
HIGH 8.4Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
ELEVATED IMPACT
Severe if exploited (CVSS 8.4), but no known exploitation and low modeled probability. Patch on a normal cadence.
Exploitation likelihood
0.4%chance of exploitation in 30 days · 28th percentile
○ In CISA KEV
○ Public exploit / PoC
Impact if exploited
8.4CVSS 3.1 · HIGH
- ConfidentialityHigh
- IntegrityHigh
- AvailabilityHigh
What an attacker needs
- ⚠Access: Requires local access to the host
- ✓Privileges: No account or privileges required
- ✓User interaction: No user interaction needed
- ✓Complexity: No special conditions — reliably repeatable
✓ lowers the bar for an attacker · ⚠ raises it
Affected
Vendors Microsoft
Products Microsoft 365 Apps For Enterprise Microsoft Office 2016 Microsoft Office 2019 Microsoft Office 365 For Mac Microsoft Office For Android Microsoft Office Ltsc 2021 Microsoft Office Ltsc 2024 Microsoft Office Ltsc For Mac 2021
Weakness (CWE)
- CWE-416: Use after free
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C