CVE-2026-44803 Windows Graphics Component Remote Code Execution Vulnerability
An integer overflow in the Windows Graphics Component allows local attackers to execute arbitrary code, requiring immediate patching.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-44803?
CVE-2026-44803 is a high-severity vulnerability in Microsoft Excel, published on 9 Jun 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
Integer overflow or wraparound in Windows Win32K - GRFX allows an unauthorized attacker to execute code locally.
Weakness: CWE-190
Which versions are affected by CVE-2026-44803?
It affects 16 products.
Products include Microsoft Excel, Microsoft Powerpoint, Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2 and 10 more.
How do I fix CVE-2026-44803?
No fix has been published for CVE-2026-44803 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-44803 being exploited?
There is no known exploitation of CVE-2026-44803 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Excel
Sources
Also known as GHSA-9978-hjf6-vg85.