## Summary
CVE-2026-63513 describes a heap-based buffer overflow in Microsoft Office that can allow an unauthorized attacker to execute code locally. The NVD indicates the issue is reachable with user interaction and results in confidentiality, integrity, and availability impact.
## Technical Details
- Vulnerability type: Heap-based buffer overflow
- CWE: CWE-122
- Reported impact scope (per NVD): C:H (confidentiality high), I:H (integrity high), A:H (availability high)
- Attack characteristics (per CVSS vector):
- AV:L (local access)
- AC:L (low complexity)
- PR:N (no privileges required)
- UI:R (requires user interaction)
## Affected
- Microsoft Office (specific product names/editions and fixed versions were not available from the provided material)
## Impact
- Potential for local code execution in the context of the affected Microsoft Office component.
- Likely outcomes include compromise of sensitive data, modification of data, and service disruption, consistent with C:H/I:H/A:H.
## Mitigation
1. Apply Microsoft Office security updates/patches for CVE-2026-63513 as soon as they are available from Microsoft.
2. Reduce exposure by limiting Office document handling from untrusted sources, since UI:R indicates user interaction is required.
3. Use endpoint protections and monitoring to detect suspicious Office behavior (e.g., unexpected process launches) following document interaction.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-122