CVE-2026-42832 Microsoft Office Spoofing Vulnerability
An unauthorized attacker can perform local spoofing in Microsoft Office due to improper access control, requiring a security patch.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-42832?
CVE-2026-42832 is a high-severity missing authorization vulnerability in Microsoft Excel, published on 12 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Improper access control in Microsoft Office allows an unauthorized attacker to perform spoofing locally.
Weakness: CWE-284
Which versions are affected by CVE-2026-42832?
It affects 4 products.
Products include Microsoft Excel, Microsoft Office, Microsoft Office Long Term Servicing Channel, Microsoft Word.
How do I fix CVE-2026-42832?
No fix has been published for CVE-2026-42832 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-42832 being exploited?
There is no known exploitation of CVE-2026-42832 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Excel
Sources
Also known as GHSA-857p-384w-97mc.